--- title: Companion Plants for Peppers and Capsicum (and What to Avoid) description: Basil, alliums and marigolds work. Fennel, brassicas, sunflowers and potatoes do not. The evidence-backed companion list for peppers, capsicum and chillies. image: https://growperma.com/hubfs/blog/images/gp-0022-hero-pepper-companions-20260408-054800.webp --- [Skip to content](https://growperma.com/blog/companion-planting-peppers-the-complete-pairing-guide#main-content) [![GrowPerma Logo](https://growperma.com/hs-fs/hubfs/icon-512.png?width=40&height=40&name=icon-512.png)](https://growperma.com/) - [Blog](https://growperma.com/blog) - [About](https://growperma.com/about) [Join the Weekly Dig](https://growperma.com/newsletter) - [Blog](https://growperma.com/blog) - [About](https://growperma.com/about) [Join the Weekly Dig](https://growperma.com/newsletter) ![Sunlit raised garden bed with bell pepper plants surrounded by basil, French marigolds, onions, and flowering cilantro in pencil-crayon illustration style](https://growperma.com/hs-fs/hubfs/blog/images/gp-0022-hero-pepper-companions-20260408-054800.webp?width=1200&height=520&name=gp-0022-hero-pepper-companions-20260408-054800.webp) In This Article Table of Contents ![Peter Vogel](https://growperma.com/hubfs/Peter%20Vogel%20Portait.png) Peter Vogel Peter Vogel is the founder of GrowPerma, bringing together evidence-based gardening advice with permaculture principles. When he's not writing about companion ... [Companion Planting](https://growperma.com/blog/tag/companion-planting) April 8, 2026 # Companion Plants for Peppers and Capsicum (and What to Avoid) ## What Are the Best Companion Plants for Peppers and Capsicum? **The best companion plants for peppers are basil, onions, garlic, chives, French marigolds, carrots, spinach, lettuce, cilantro, oregano, and nasturtium. Keep fennel, brassicas, sunflowers, and potatoes away from them.** The list is the same for every *Capsicum annuum* on the seed rack, so it holds whether yours is labeled capsicum, bell pepper, sweet pepper, green pepper, chilli, or jalapeño. Each pairing below either repels a named pepper pest, feeds a predator insect, or shades the soil, and every one of them rests on a university extension publication or a peer-reviewed study rather than on tradition. Get the neighbors right and it shows up as fewer aphids, less disease and a longer picking season. We dug into 40+ sources from Penn State, Cornell, the University of Minnesota, USDA, and peer-reviewed journals so you don't have to guess which "companion planting" claims are real and which are folklore. (For the wider picture across every vegetable, see our [complete companion planting chart](https://growperma.com/blog/companion-planting-chart-the-complete-guide-for-every-vegetable).) ~50% Root-knot nematode reduction French marigolds vs bare ground (PMC) 4–6× Available P & K boost Pepper intercropping vs monoculture 18–24" Spacing per pepper plant UC ANR, Pepper Geek, Clemson HGIC 3–4 yrs Solanaceae rotation interval Penn State, NCSU, UMN Extension Key Takeaway Stick to basil, alliums, marigolds, and a few flowering herbs for the strongest, evidence-backed pepper companions. Skip fennel, brassicas, sunflowers, and potatoes — research shows they actively hurt pepper growth. ## Capsicum, Chilli, Bell Pepper: One Species, One Companion List Capsicum is what this plant is called in Australia, New Zealand, the UK, India and South Africa. A US seed catalog calls the same fruit a bell pepper, a sweet pepper or a green pepper. Chilli (chili in the US), jalapeño, serrano and habanero are the hot types of the same species, *Capsicum annuum*. They share their pests, they share their diseases, and so they share their companions. Every pairing on this page applies to all of them. What does change is the climate you grow them in, not the variety. In the UK and the cooler half of New Zealand capsicum is a tunnel or glasshouse crop, and the pairings shift a little under cover: there are no bumblebees to shake the flowers, and basil mildews faster in still air. [What to grow in a greenhouse, what to pair and what to skip](https://growperma.com/blog/what-to-grow-in-a-greenhouse-crops-pairings-and-what-to-skip) covers that case. In a frost-free garden the plant is a short-lived perennial rather than an annual, so a pepper that cropped well is worth keeping through the cool season: [how to overwinter peppers](https://growperma.com/blog/overwintering-peppers). ### Do Hot Peppers Need Different Companions Than Sweet Peppers? No. Same species, same pest pressure, same list. Two beliefs about mixing hot and sweet types in one bed are worth correcting, because both get repeated every season: - **Cross-pollination will not make this year’s sweet peppers hot.** If a bee carries jalapeño pollen to a bell pepper flower, the capsaicin genetics land in the seeds, not in the fruit wall around them, and the fruit wall is the part you eat. It matters only if you save seed: then separate hot from sweet by 50 feet (15 m) or more, or bag a few flowers by hand. - **Hot types are smaller, so they interplant more easily.** A jalapeño at 14 to 18 inches (35 to 45 cm) leaves room for a basil plant between stems. A bell pepper at 18 to 24 inches (45 to 60 cm) does not, which is why the layout further down puts basil in the gaps rather than in the row. ## Top 8 Companion Plants for Peppers (And Why They Work) Here's what the science actually says about each plant. We've ordered them from "absolutely plant this" to "useful in specific situations." ![Top-down view of a 4-foot by 4-foot raised bed showing companion planting layout for peppers with basil, onions, marigolds, cilantro, and lettuce](https://growperma.com/hubfs/blog/images/gp-0022-body1-raised-bed-layout-20260408-054814.webp) ### 1. Basil — The Most Evidence-Backed Pepper Companion Basil (*Ocimum basilicum*) is the gold standard pepper companion. Its leaves contain linalool, a volatile compound that acts as both an insecticide and a repellent against thrips, whiteflies, and aphids — three of the worst pepper pests. In lab tests, basil oil and its main constituents killed 90% of fruit flies in just 8 to 38 minutes at 10% concentration, according to [research published in PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC5746795/). Basil also masks the volatile chemicals that aphids use to find pepper plants. (Basil isn't unique here — most aromatic herbs pull double duty in the vegetable garden, which is why we cover them all in our [companion planting herbs guide](https://growperma.com/blog/companion-planting-herbs-the-complete-guide).) And because basil and peppers share almost identical growing conditions — warm temps (65–85°F), similar watering, full sun — they don't compete with each other. Plant basil 8–10 inches from the base of each pepper plant. The shorter herb (10–16 inches at maturity) actually benefits from afternoon shade thrown by the taller pepper canopy. Why This Works (Permaculture Lens) Basil and peppers form a textbook **plant guild** — a permaculture concept where multiple species occupy the same space and stack functions. Basil contributes pest control and pollinator habitat, peppers contribute structural shade, and both share the same warm-soil microclimate. You're not just companion planting — you're building a mini-ecosystem. ### 2. Onions, Garlic, and Chives — The Allium Pest Wall ![Green onion scallions and flowering garlic chives growing alongside pepper plants](https://growperma.com/hubfs/blog/images/gp-0022-float-right-onions-chives-20260408-054820.webp) Alliums show up on every single university extension list of pepper companions we examined. Their volatile sulfur compounds — dimethyl disulfide, dimethyl trisulfide, and related chemicals — repel aphids, spider mites, and the carrot rust fly. Lab research with green peach aphids (a documented pepper pest) showed that chives interfered with aphid host-finding through olfactory masking, according to a [study indexed in PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC8539092/). Their root systems also aerate compacted soil, improving water infiltration around pepper roots. **One catch:** never plant alliums next to beans or [peas](https://growperma.com/blog/companion-planting-peas-springs-best-garden-starter). They inhibit legume nitrogen fixation by interfering with the rhizobial bacteria in legume root nodules. Since you shouldn't be planting beans next to peppers anyway (more on that below), this isn't usually a problem. ### 3. French Marigolds — The Nematode Killer ![Bright orange and yellow French marigold flowers blooming at the edge of a raised bed with pepper plants in background](https://growperma.com/hubfs/blog/images/gp-0022-float-left-marigolds-20260408-054824.webp) French marigolds (*Tagetes patula*) have been recommended for over 60 years as a nematode suppressant — and unlike most folk remedies, this one has serious science behind it. Marigold roots produce alpha-terthienyl, a polyacetylenic compound that triggers reactive oxygen species in root-knot nematodes (*Meloidogyne incognita*), the species that devastates pepper roots. Research by Marahatta and colleagues, [published through PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC3593261/), found that French marigold suppressed approximately 50% of *M. incognita* compared to bare ground when planted immediately after a susceptible host crop. The catch: marigolds work best when nematodes are actively mobile in moist soil, and they're most effective when planted as a full season "cleansing crop" before peppers. ### 4. Carrots — Soil Looseners with Zero Conflict Carrots make great pepper neighbors because their long taproots break up compacted soil layers below the pepper rootzone, improving drainage and air movement. They take up no allelopathic chemicals that interfere with peppers, mature on a different schedule (so harvest doesn't disturb peppers), and can be tucked in tight to the pepper base without competition for light. ### 5. Spinach and Lettuce — The Living Mulch Cool-season leafy greens like spinach, loose-leaf lettuce, and arugula make excellent early-season pepper companions. Plant them in early spring before pepper transplants go in. They'll mature quickly, providing living mulch that suppresses weeds, retains soil moisture, and moderates soil temperature — all while you're waiting for the soil to warm up for peppers. By the time peppers need the space and full sun, the greens are usually ready to harvest. ![Close-up of bell pepper plants intercropped with sweet basil and parasitic wasps visiting basil flowers](https://growperma.com/hubfs/blog/images/gp-0022-body2-pepper-basil-wasps-20260408-054815.webp) ### 6. Cilantro and Dill — Beneficial Insect Magnets Cilantro (*Coriandrum sativum*) and dill (*Anethum graveolens*) work differently from the others on this list. Instead of repelling pests, they attract *predators* of pests — parasitic wasps, hoverflies (whose larvae devour aphids), and lacewings. Cornell Cooperative Extension [documents](https://ulster.cce.cornell.edu/resources/companion-planting-and-flower-borders) that flowering dill and [coriander](https://growperma.com/blog/companion-planting-cilantro-and-coriander) substantially increase parasitoid populations in adjacent vegetable beds, particularly improving Colorado potato beetle predation in eggplant fields. The trick: you have to let them flower. Cilantro harvested for leaves doesn't generate beneficial insect attraction. Plan to let about 25–33% of your cilantro plants bolt and flower for pest management while harvesting the rest for the kitchen. ### 7. Oregano and Parsley — Pollinator and Predator Support Oregano (*Origanum vulgare*) does triple duty: its thymol and carvacrol oils have documented insecticidal properties, its low-growing varieties provide [ground cover](https://growperma.com/blog/ground-cover-plants-for-food-forests-the-living-mulch-layer) and weed suppression, and its flowers [attract bees](https://growperma.com/blog/companion-planting-for-pollinators-attract-bees-and-butterflies) and butterflies. Why does that matter for peppers? Pepper flowers are self-fertile but benefit substantially from **buzz pollination** — the vibration that bumble bees create to release pollen from porose anthers. [Research on greenhouse sweet peppers](https://onlinelibrary.wiley.com/doi/full/10.1046/j.0016-8025.2001.00807.x) showed that bumble bee pollination increased fruit weight and seed number compared to wind-pollinated or hand-pollinated controls. So inviting more bees to your pepper bed isn't just nice — it makes for bigger, fuller peppers. ### 8. Nasturtium — The Aphid Trap Crop Nasturtium (*Tropaeolum majus*) is the classic trap crop for aphids. Aphids prefer nasturtium foliage to almost any other host plant, so when both grow in the same bed, the aphids concentrate on the nasturtium and leave the peppers alone. Plant nasturtium at the bed edges in early spring so it's flowering when the first aphid generations arrive. ## Plants to Avoid Near Peppers (and Why) Some traditional companion planting guides will tell you to plant fennel and brassicas near peppers. The research says don't. ![Pepper companion planting compatibility infographic showing good companions like basil, alliums, marigold, carrots, and bad companions like fennel, brassicas, sunflowers](https://growperma.com/hubfs/blog/images/gp-0022-infographic-compatibility-20260408-054821.webp) | Do not plant near peppers | What goes wrong | Plant this instead | | --- | --- | --- | | Fennel | Roots release terpenes that stunt pepper growth, and it competes hard for water | Dill or cilantro: the same predator insects, none of the suppression | | Cabbage, broccoli, kale, cauliflower | Heavy feeders drawing down the same nitrogen and phosphorus at the same point in the season | Lettuce or spinach as an early-season living mulch | | Sunflowers | Allelopathic compounds from roots and hulls, plus heavy shade over a full-sun crop | French marigolds or nasturtium: flowers at pepper height | | Potatoes | Same family, so a disease bridge for verticillium, early blight and Colorado potato beetle | Carrots: they loosen the soil and share none of the pepper diseases | | Tomatoes, eggplant, tomatillos | Also Solanaceae. Workable but risky: shared blight and wilt pressure, and one infected plant reaches the rest | Same rotation block, not shoulder to shoulder, and move the whole family together | | Black walnut, inside the root zone | Juglone. Peppers sit on most extension lists of juglone-sensitive vegetables, next to tomato and eggplant | A raised bed well clear of the canopy and its drip line | Peppers are not a special case in any of this. The same two mechanisms, a shared plant family and a competing appetite, drive most [plant combinations that do not work](https://growperma.com/blog/what-not-to-plant-together-the-complete-incompatibility-guide). Two neighbors that come up constantly and are both fine: okra, which wants the same heat and water as a pepper and has [its own companion list](https://growperma.com/blog/okra-companion-plants-what-to-grow-alongside-it), and tomatillos, which are Solanaceae and so belong in the pepper rotation block rather than in the next row over ([what to plant with tomatillos](https://growperma.com/blog/companion-planting-tomatillos-salsa-garden-design)). ### Fennel — Allelopathic Suppressor Despite being recommended in older companion planting books, fennel (*Foeniculum vulgare*) actively inhibits pepper growth. Recent [peer-reviewed research published through PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC9218821/) found that fennel roots release five distinct terpenes — D-limonene, estragole, anethole, gamma-terpenes, and beta-myrcene — that interfere with neighboring plants. While these compounds did suppress *Phytophthora capsici* infection in peppers, fennel simultaneously stunted pepper growth through allelopathic root chemicals and aggressive deep-root competition for water and nutrients. The disease prevention benefit doesn't make up for the growth suppression. Fennel is not being awkward about peppers in particular: it is [the garden loner that almost nothing pairs with](https://growperma.com/blog/companion-planting-fennel-the-garden-loner-and-exceptions). ### Brassicas (Cabbage, Broccoli, Kale, Cauliflower) Brassicas are heavy feeders — they need almost as much nitrogen, phosphorus, and potassium as peppers do. Plant them next to each other and they'll exhaust soil nutrients faster than either crop can replace them, dropping yields on both sides. They also share pest pressure: flea beetles, aphids, thrips, and cabbage worms hit both groups, so intercropping just concentrates the problem instead of distributing it. If both crops have to share one garden, keep them in separate beds and give the brassicas [their own companion set](https://growperma.com/blog/cabbage-companion-plants-what-to-grow-and-avoid-nearby). ### Sunflowers Sunflowers look beautiful but they're a double problem for peppers. Their roots release allelopathic compounds that inhibit seed germination and seedling growth, and at six to eight feet tall they cast deep shade that drops pepper light below the 6–8 hours of direct sun peppers need. If you want sunflowers in the garden, plant them at least 8–10 feet from your pepper bed. ### Potatoes (and Most Solanaceae) Potatoes are pepper relatives in the Solanaceae family. They share the same diseases — *Verticillium*, *Fusarium*, late blight, early blight — and they need to be dug up at exactly the moment your peppers are hitting peak production, which damages pepper roots and exposes the soil bed. The Clemson University Home & Garden Information Center [explicitly recommends](https://hgic.clemson.edu/factsheet/pepper/) avoiding any area where eggplant, tobacco, pepper, tomato, or Irish potato grew the previous year. Watch Out: The Pepper-Tomato Question You can plant tomatoes near peppers — they're often listed as companions because they share growing conditions and tomatoes can act as a trap crop for aphids. But because they share *Verticillium*, *Fusarium*, late blight, and early blight, you need to rotate them out of that spot for 3–4 years afterward. If your soil already has Solanaceae disease history, skip the pairing entirely. For the full breakdown of which plants pair with tomatoes (and which don't), see [what to plant with tomatoes](https://growperma.com/blog/what-to-plant-with-tomatoes-best-and-worst-companions). ## How to Plant Peppers with Companions: Step-by-Step Here's how to set up a 4×4 raised bed with peppers and companions for the best results. Total time: about 90 minutes. Cost: under $25 if you grow most plants from seed. Depth matters more than width for this crop. Pepper roots reach 18 to 24 inches (45 to 60 cm) in open ground, and in a shallow frame they stay in the top 6 inches (15 cm) and dry out between waterings, which is where uneven watering and blossom-end rot start. If you are still choosing the frame, our notes on [raised bed depth and material for peppers](https://growperma.com/blog/best-raised-garden-beds) set out what 12 inches of soil buys you over 6. 1 Prep the bed (week before planting) Top-dress your raised bed with 1–2 inches of finished compost. Pepper roots are sensitive — don't dig the compost in, just spread it on top and let the worms work it down (this is the same principle behind [no-dig gardening](https://growperma.com/blog/no-dig-gardening-build-soil-without-breaking-it), which keeps soil structure and microbiology intact). Soil temperature should hit 65°F before transplanting; below that, peppers stall. 2 Plant peppers at 18-inch spacing In a 4×4 bed, set 4 pepper plants in a square pattern, each 18 inches apart and at least 12 inches from the bed edge. Bury them slightly deeper than they sat in the [nursery](https://growperma.com/blog/permaculture-plant-nursery-propagate-your-own-plants) pot — peppers will root from buried stems just like tomatoes. Water in with a kelp-based root drench, and slip a cardboard collar around each stem while you are there. It costs nothing and it is the one reliable defense against [cutworms taking a transplant off at the base](https://growperma.com/blog/cutworms-how-to-spot-the-damage-and-stop-it) overnight. 3 Tuck in basil between peppers Plant 2–4 basil seedlings in the gaps between peppers, 8–10 inches from each pepper stem. Genovese basil works best because it stays under 16 inches and keeps its volatile oils strong all summer. Pinch the flower buds the first few weeks to keep the leaves coming. 4 Add alliums and marigolds at the edges Tuck onion sets, garlic cloves, or chive divisions along one edge of the bed. At the corners, plant 2–4 French marigolds (*Tagetes patula*, not the giant African type). Save a third corner for cilantro or dill — let them flower for the predators. 5 Mulch and water deeply Add 2–3 inches of straw or shredded leaf mulch around the base of every plant, leaving a small gap around each stem. Mulch reduces soil splash that spreads *Phytophthora*, retains moisture, and keeps pepper roots cool. Water deeply once a week — about 1 inch — at the soil level rather than overhead. ## Pepper Companion Compatibility Chart A quick-reference table you can save for planning. All recommendations cross-checked against US university extension publications. If you would rather have it on paper by the shed door, there is a [printable companion planting chart](https://growperma.com/blog/printable-companion-planting-chart-for-your-garden-shed) as well. | Plant | Compatibility | Mechanism | Source | | --- | --- | --- | --- | | Basil | Excellent | Linalool repels thrips, whiteflies, aphids | PMC, Park Seed | | Onions / Garlic / Chives | Excellent | Sulfur compounds repel aphids & mites | UMN, Park Seed | | French Marigold | Excellent | Alpha-terthienyl suppresses root-knot nematodes | PMC (Marahatta et al.) | | Carrots | Good | Loosens soil, no competition | U of Arizona Ext. | | Spinach / Lettuce | Good (early season) | Living mulch, soil moisture | NCSU Ext. | | Cilantro / Dill (flowering) | Good | Attracts parasitic wasps and hoverflies | Cornell CCE | | Oregano | Good | Thymol/carvacrol + bee attraction | USDA | | Nasturtium | Good | Aphid trap crop | Park Seed | | Tomatoes | Cautious | Same family — disease risk | UMN, USU Ext. | | Fennel | Avoid | Allelopathic suppression | PMC (2024) | | Brassicas | Avoid | Heavy feeder competition | U of Alaska Fairbanks | | Sunflowers | Avoid | Allelopathy [allelopathy and juglone sensitivity](https://growperma.com/blog/allelopathy-in-the-garden-when-plants-inhibit-each-other) + shade | Park Seed | | Potatoes | Avoid | Solanaceae disease bridge | Clemson HGIC | Sources: Penn State Extension, Cornell Cooperative Extension, Clemson HGIC, University of Arizona Extension, University of Minnesota Extension, Utah State University Extension, USDA. Key Takeaway Build your bed around basil + alliums + marigolds for the strongest evidence-backed combination. Add cilantro or dill for predator support, and skip fennel, brassicas, sunflowers, and any Solanaceae relative. ## Container and Small-Space Pepper Companion Combos If you're growing peppers in 5-gallon buckets or grow bags on a balcony, intercropping inside the same container gets tight fast. A single pepper needs the entire 5-gallon volume to root properly. Instead, run an "adjacent container" system: keep your pepper in its own pot, then place a 1-gallon basil pot and a 1-gallon marigold pot directly next to it. The volatile compounds still travel, the beneficial insects still find both, but each plant gets the rooting space it needs. This is exactly how commercial container pepper growers run greenhouse production. Why This Works (Permaculture Lens) This is **[stacking functions](https://growperma.com/blog/stacking-functions-in-the-garden-one-element-multiple-uses) in space, not just in soil**. The permaculture principle "use small and slow solutions" doesn't mean tiny gardens — it means using the resources you have efficiently. A balcony with three small pots producing peppers, basil, and marigolds isn't a compromise; it's a fully functional polyculture in miniature. ## Frequently Asked Questions ### What should you not plant with peppers? Avoid fennel, brassicas (cabbage, broccoli, kale, cauliflower, kohlrabi), sunflowers, potatoes, and apricots near peppers. Fennel releases allelopathic compounds that stunt pepper growth, brassicas compete for the same nutrients, sunflowers cast deep shade and release inhibitory root chemicals, and potatoes share serious soilborne diseases including *Verticillium* and *Fusarium*. ### Can you plant tomatoes and peppers together? Yes, but with caution. Tomatoes and peppers are both Solanaceae (nightshades) and share several diseases including late blight, early blight, *Verticillium* wilt, and *Fusarium*. They can grow together in a single bed if disease pressure is low and you maintain at least 24 inches between plants — but you'll need to rotate them out of that spot for 3–4 years afterward, according to [Penn State Extension's family rotation guide](https://extension.psu.edu/plant-rotation-in-the-garden-based-on-plant-families/). ### Can you plant tomatoes and jalapeños together? The same Solanaceae rules apply — jalapeños are *Capsicum annuum* just like bell peppers. Tomatoes and jalapeños share the same disease vulnerabilities, but if your soil is healthy and you're committed to a 3–4 year rotation, they grow well together with proper spacing. ### What grows best with bell peppers in a raised bed? For a 4×4 raised bed: 4 bell pepper plants at 18-inch spacing, 2–4 basil seedlings tucked between them, onions or garlic along one edge, French marigolds at two corners, and cilantro at the other corner allowed to flower. This creates a layered system with pest repellents, [beneficial insect attractors](https://growperma.com/blog/companion-planting-cosmos-beneficial-insect-attractors), and nematode suppression all in one bed. Pair this layout with [living soil](https://growperma.com/blog/soil-health-guide-how-to-build-living-soil-for-a-thriving-garden) for the strongest results. ### Can I plant thyme with peppers? Yes — thyme (*Thymus vulgaris*) is an excellent perennial companion. It stays low (under 12 inches), produces flowers attractive to bees, and its volatile oils have insecticidal properties similar to oregano. Plant it at the edges or corners of a raised bed where it can establish for multiple seasons. ### Are peppers and tomatoes related? Yes. Both belong to the Solanaceae (nightshade) family, along with eggplant, potatoes, tobacco, and tomatillos. This is why they share pest and disease vulnerabilities and why university extension services recommend rotating them on a 3–4 year cycle. ### How do you grow tomatoes and peppers together successfully? Space them at least 24 inches apart, use [drip irrigation](https://growperma.com/blog/drip-irrigation-vegetable-garden-setup-spacing-and-run-times) at soil level (not overhead) to prevent splash-spread of *Phytophthora*, mulch heavily to keep soil off lower foliage, and plan to move both crops to a completely different bed for the next 3–4 seasons. Healthy soil and rapid removal of any diseased plant material are essential. Get the Weekly Dig One practical permaculture guide a week, written for gardeners who do this on weekends: companion pairings that hold up under scrutiny, and the ones that do not. Free, no spam, unsubscribe any time. [Join the Weekly Dig](https://growperma.com/newsletter) [Browse All Guides →](https://growperma.com/blog) ## Resources - [Marahatta et al., French marigold & root-knot nematode suppression (PMC)](https://pmc.ncbi.nlm.nih.gov/articles/PMC3593261/) - [Fennel allelopathy and Phytophthora capsici interaction (PMC)](https://pmc.ncbi.nlm.nih.gov/articles/PMC9218821/) - [Basil oil insecticidal activity against fruit flies (PMC)](https://pmc.ncbi.nlm.nih.gov/articles/PMC5746795/) - [Allium volatiles & aphid host-finding interference (PMC)](https://pmc.ncbi.nlm.nih.gov/articles/PMC8539092/) - [Bumble bee buzz pollination of greenhouse sweet peppers (Wiley)](https://onlinelibrary.wiley.com/doi/full/10.1046/j.0016-8025.2001.00807.x) - [Penn State Extension — Plant Rotation by Family](https://extension.psu.edu/plant-rotation-in-the-garden-based-on-plant-families/) - [University of Minnesota Extension — Late Blight](https://extension.umn.edu/disease-management/late-blight) - [Utah State University Extension — Pepper Wilts](https://extension.usu.edu/vegetableguide/tomato-pepper-eggplant/wilts) - [University of Arizona Extension — Companion Planting Guide (PDF)](https://extension.arizona.edu/sites/default/files/attachment/CompanionPlantingApr2023.pdf) - [Cornell Cooperative Extension — Companion Planting and Flower Borders](https://ulster.cce.cornell.edu/resources/companion-planting-and-flower-borders) - [Clemson University Home & Garden Information Center — Pepper Factsheet](https://hgic.clemson.edu/factsheet/pepper/) - [USDA — Pairing Plant Buddies](https://www.usda.gov/about-usda/news/blog/pairing-plant-buddies) - [Pepper Geek — Pepper Plant Spacing](https://peppergeek.com/pepper-plant-spacing/) - [Park Seed — Top 12 Pepper Companion Plants & 3 to Avoid](https://www.parkseed.com/blogs/park-seed-blog/top-12-pepper-companion-plants-3-to-avoid) **Tags:** [Companion Planting](https://growperma.com/blog/tag/companion-planting) ## Related Articles ![Raspberry canes held between wires on a wooden T-trellis with ripe berries and a gardener tying a cane with soft twine](https://growperma.com/hs-fs/hubfs/blog/images/gp-1137-hero-berry-trellis-20260925-053040.webp?width=400&height=220&name=gp-1137-hero-berry-trellis-20260925-053040.webp) 25 Sep [Companion Planting](https://growperma.com/blog/tag/companion-planting) #### Blackberry and Raspberry Trellis: Dimensions by Type and How to Build One Peter Vogel ![Cucumber vines on a green A-frame trellis over a raised bed with straight cucumbers hanging and a hand picking one, pole beans on a teepee behind](https://growperma.com/hs-fs/hubfs/blog/images/gp-1136-hero-cucumber-trellis-20260924-180613.webp?width=400&height=220&name=gp-1136-hero-cucumber-trellis-20260924-180613.webp) 24 Sep [Companion Planting](https://growperma.com/blog/tag/companion-planting) #### Cucumber Trellis: How Tall, Which Kind, and What to Buy for Every Climber Peter Vogel ![Late autumn raised bed of frost-touched collard greens interplanted with sweet alyssum and a row of dill going to seed behind](https://growperma.com/hs-fs/hubfs/blog/images/gp-0548-hero-collard-bed-20260908-064751.webp?width=400&height=220&name=gp-0548-hero-collard-bed-20260908-064751.webp) 8 Sep [Companion Planting](https://growperma.com/blog/tag/companion-planting) #### Collard Companion Plants: What the Evidence Supports Peter Vogel ![GrowPerma](https://growperma.com/hubfs/icon-512.png) Gardens That Work Like Forests — the smart-friend guide to permaculture for normal backyards. #### Explore - [Blog](https://growperma.com/blog) - [Companion Planting](https://growperma.com/blog/tag/companion-planting) - [Soil & Composting](https://growperma.com/blog/tag/soil-composting) - [Food Forests](https://growperma.com/blog/tag/food-forest) - [Permaculture](https://growperma.com/blog/tag/permaculture-foundations) #### Resources - [About](https://growperma.com/about) - [All Articles](https://growperma.com/blog) #### Legal - [Imprint](https://growperma.com/imprint) - [Privacy Policy](https://growperma.com/privacy-policy) - [Affiliate Disclosure](https://growperma.com/affiliate-disclosure) - Cookie Settings As an Amazon Associate I earn from qualifying purchases. 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Includes raised bed layout, FAQs, and chart.", "headline" : "Companion Planting Peppers: The Complete Pairing Guide", "image" : "https://148149462.fs1.hubspotusercontent-eu1.net/hubfs/148149462/blog/images/gp-0022-hero-pepper-companions-20260408-054800.webp", "mainEntityOfPage" : { "@id" : "https://growperma.com/blog/companion-planting-peppers-the-complete-pairing-guide", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://growperma.com/hubfs/growperma-logo.png" }, "name" : "GrowPerma" } } ``` ```json { "@context" : "https://schema.org", "@type" : "FAQPage", "mainEntity" : [ { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Avoid fennel, brassicas (cabbage, broccoli, kale, cauliflower, kohlrabi), sunflowers, potatoes, and apricots near peppers. Fennel releases allelopathic compounds that stunt pepper growth, brassicas compete for the same nutrients, sunflowers cast deep shade and release inhibitory root chemicals, and potatoes share serious soilborne diseases including Verticillium and Fusarium." }, "name" : "What should you not plant with peppers?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Yes, but with caution. Tomatoes and peppers are both Solanaceae and share several diseases including late blight, early blight, Verticillium wilt, and Fusarium. They can grow together if disease pressure is low and you maintain at least 24 inches between plants, but you will need to rotate them out of that spot for 3 to 4 years afterward." }, "name" : "Can you plant tomatoes and peppers together?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "For a 4x4 raised bed: 4 bell pepper plants at 18-inch spacing, 2 to 4 basil seedlings tucked between them, onions or garlic along one edge, French marigolds at two corners, and cilantro at the other corner allowed to flower." }, "name" : "What grows best with bell peppers in a raised bed?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Yes. Thyme is an excellent perennial companion. It stays low (under 12 inches), produces flowers attractive to bees, and its volatile oils have insecticidal properties similar to oregano." }, "name" : "Can I plant thyme with peppers?" } ] } ```