What to Plant With Strawberries for Bigger Harvests

Your strawberry bed could yield more with almost no extra work — you just need the right neighbours. The best companion planting strawberries strategy isn't about chasing folklore promises of "35% bigger harvests." It's about building a small, evidence-backed plant community that improves pollination, softens pest pressure, and protects your berries from the one disease that devastates most strawberry beds: Verticillium wilt.

This guide pulls from university extension research (Penn State, Cornell, UC Davis, NC State), peer-reviewed pollination studies, and permaculture design to give you a clear shortlist — what to plant with strawberries, what to absolutely keep away, and a simple 4-step plan for a 4×4 raised bed you can set up this weekend.

Quick Answer: The Top 10 Strawberry Companions

Most of the traffic around "strawberry companion plants" leads gardeners to vague, unsourced lists. The table below summarises the evidence-backed pairings, drawn from university extension guides and peer-reviewed studies. Confidence ratings reflect how well the benefit is documented in field trials — not just folklore.

Sources: Penn State Extension – Growing Strawberries, Garibaldi et al. 2013 (Proc. Royal Society B), Klatt et al. 2014 (Biological Conservation), USDA NRCS Cover Crops Overview (PDF).

What to Plant With Strawberries (By Role)

The most useful way to think about strawberry neighbours is by the job they do in the bed. You want at least one plant in each of four roles: pollinator support, pest moderation, ground cover, and (optionally) nitrogen fixation. For a complete overview of how these roles interact across all crops, our companion planting chart maps every major vegetable to its best partners.

Borage: The Pollinator Powerhouse

Strawberries are self-fertile, but they're not fully self-pollinated — each of the tiny achenes (the "seeds" on the outside of the berry) needs to be pollinated for the fruit to swell into a full, symmetrical berry. A study of 41 strawberry fields by Garibaldi and colleagues found that fields with more than five bee visits per flower per day produced berries that were 5 to 15% heavier and rounder than fields with poor pollination. Translation: malformed, lopsided strawberries usually mean the flowers weren't visited enough.

Borage (Borago officinalis) is one of the most reliable pollinator magnets you can plant. Its bright blue, star-shaped flowers produce nectar continuously through June and July — exactly when June-bearing strawberries are blooming. Plant two or three borage plants on the north side of the bed (so they don't shade the berries) about 18 inches back from the strawberries. The root system is deeper than a strawberry's, so keep spacing generous.

The widely repeated claim that "borage boosts strawberry yield by 35%" is one we couldn't trace to a controlled trial — it appears to be a permaculture-community extrapolation from Mollison and Hemenway's work. The honest version: borage reliably improves pollination, and improved pollination reliably makes bigger berries. The mechanism is real; the exact percentage isn't. For the broader pollinator angle, our guide to companion planting flowers in the vegetable garden covers borage alongside alyssum, calendula, and nasturtium.

Chives, Garlic, and the Allium Family

Alliums — chives, garlic, onions — are traditional strawberry neighbours, and the theory is that their sulphur volatiles (allicin and relatives) deter aphids and spider mites. The greenhouse evidence is real: Arimura and colleagues (2010) showed garlic extract reduces Lygus bug settling on strawberries. The field evidence is weaker, so treat alliums as a supportive layer rather than a standalone pest-control solution.

Practical setup: chives (4–6 inch roots, shallow) can be interplanted between strawberry plants at roughly 6- to 9-inch spacing. Garlic and onions compete more aggressively for nitrogen, so plant them in pathways or along the bed perimeter instead of inside the bed. Our deeper dive on companion planting herbs walks through chives, thyme, dill, and oregano in more detail.

Thyme, Alyssum, and Low Ground Covers

Thyme (Thymus vulgaris) is the quiet hero of strawberry beds. It stays under 10 inches, tolerates drought, flowers profusely in late spring, and attracts small solitary bees and hoverflies — the same insects whose larvae eat aphids. Alyssum does a similar job with faster establishment. Scatter either along bed edges and in shallow gaps between strawberry plants.

These low covers also serve a permaculture function: they fill the "ground cover" layer that reduces bare soil exposure, moderates moisture loss, and creates habitat for ground beetles — the main predator of slug eggs.

Peas, Beans, and Nitrogen Fixation

Legume companions fix atmospheric nitrogen through Rhizobium bacteria in their root nodules. A University of Maryland trial intercropping strawberries with spring peas and summer clover found year-1 strawberry yield held steady and soil nitrogen rose 12–18% — setting up a potential yield gain in year 2. The USDA NRCS confirms peas and beans fix roughly 50–90 pounds of nitrogen per acre per year, and white clover in pathways can deliver 100–150 pounds.

Keep legumes at the perimeter or in pathways, not directly under strawberry crowns, and remove pea vines in June so they don't compete during peak fruiting. If you want a dedicated breakdown on legumes, see our guide to companion planting beans.

Plants to Avoid With Strawberries — This One Matters

Sources: Penn State Extension – Strawberry Disease: Verticillium Wilt, NC State – Strawberry Disease Management, UMass – Strawberry IPM: Verticillium Wilt.

If you've had tomatoes, peppers, or potatoes growing in a spot within the past three years, do not plant strawberries there. Either pick a new location, build a raised bed with fresh soil, or plant a marigold or mustard biofumigation cover crop for two seasons before replanting. A University of Florida IFAS study showed mustard cover crops reduced anthracnose incidence by 40% and Verticillium detection by 15% in the first year of strawberry planting.

The 4-Step Strawberry Guild (for a 4×4 Raised Bed)

Here's the simplest evidence-backed setup. A 4×4 foot (1.2 × 1.2 m) raised bed at least 12 inches (30 cm) deep gives you 16 square feet of planting area — enough for four productive June-bearing strawberry plants plus a full supporting cast. Total setup time: about two hours. Cost: under $50 if you already have the bed built.

This guild setup reflects the same logic you'll find in a food forest at the smallest scale: the strawberry is your ground-cover layer, thyme and alyssum fill interstitial spaces, chives occupy the same vertical band, and borage provides a taller herbaceous structure. The result is almost full soil coverage, continuous flowering from May through July, and roughly four distinct insect-attracting habits in a single 4×4 footprint.

If you want a more advanced strawberry-containing system, look at the permaculture ground-cover layer in a small backyard food forest — the principles are identical, just scaled up.

What About Containers and Balcony Beds?

Containers (12–24 inch / 30–60 cm) limit what you can fit — deep-rooted borage will choke a strawberry in a pot. Stick to shallow-rooted companions: alpine strawberries as an edge, thyme or dwarf oregano around the base, and a single chive clump. Skip lettuce (shades crowns), mint (invasive), and anything over 18 inches tall. For fertiliser, a monthly liquid feed or top-dress of worm castings does more for container strawberries than most companion plants can.

Seasonal Timing for US Growing Zones

Timing matters almost as much as plant choice — the whole point of pollinator companions is to have them flowering during strawberry bloom. Here's the simplified calendar for temperate zones (USDA 5–7):

Sources: Cornell Fruit Resources – Strawberry Production, UC IPM – Strawberry Pest Management Guidelines.

Southern growers (zones 8–9) run an inverted calendar — transplant in October–November, harvest December through May, and use chives and thyme as cool-season companions. The principle is the same: match your pollinator-attractor's bloom time to your berries' bloom time.

Frequently Asked Questions

Can I plant strawberries and tomatoes in the same raised bed if I use a barrier?

No. Verticillium dahliae moves through soil water and organic matter — a physical barrier inside the same bed doesn't stop it. The safe approach is a completely separate raised bed, or a minimum 3–5 year rotation between crops in the same soil.

Do strawberries like being near mint?

Strawberries don't mind mint chemically, but mint is both a Verticillium host and an aggressive spreader — a few runners can take over a bed in one season. If you love mint, grow it in a buried pot with the rim above soil level, at least 2 feet (60 cm) from strawberries.

Will marigolds protect strawberries from pests?

Partially. Marigolds reliably attract hoverflies and small bees, which does help with aphid pressure. But the popular claim that marigolds suppress strawberry pests through allelopathy isn't supported by field trials. Plant them for the pollinators, not the pest magic — and see our deeper dive on companion planting marigolds for the full evidence review.

Can I plant garlic with strawberries in the fall?

Yes, and autumn-planted garlic along the bed perimeter (not in the bed itself) is a genuinely useful pairing — it doesn't compete during strawberry harvest and you'll pull it in July, right as strawberry production tapers. Just don't overlap their root zones.

What's the best low-maintenance companion for strawberries?

Thyme. It needs little water, flowers for weeks, attracts pollinators, serves as ground cover, and requires essentially no management beyond occasional trimming.

Do I need companions if my strawberries already fruit well?

Not strictly — strawberries can produce decent crops alone. But even a couple of borage plants and a line of thyme usually add 5–15% in fruit weight through better pollination (and make the bed look considerably nicer). If pest pressure has been low and yields are strong, think of companions as yield insurance rather than a rescue strategy.

How many strawberry plants can I fit in a 4×4 raised bed with companions?

Four to six June-bearing plants at 12-inch (30 cm) spacing leaves you 10–12 square feet for companions. That's comfortable room for two borage, two dill, four or five chive clumps, alpine strawberry corners, and scattered thyme or alyssum.

Is companion planting actually a permaculture thing, or just folk wisdom?

Both. Traditional folk pairings (marigolds with everything, tomatoes and basil) mix solid ecology with unverified claims. Modern permaculture, drawing on Hemenway's Gaia's Garden and Toensmeier & Bane's Edible Forest Gardens, formalises the same idea as plant "guilds" built around shared niches — and the evidence-backed pairings you see above mostly match what both traditions recommend. If you're new to the broader framework, start with our primer on what permaculture actually is.

Resources

• Penn State Extension — Growing Strawberries (complete home-gardener guide)
• Penn State Extension — Strawberry Disease: Verticillium Wilt
• Cornell Fruit Resources — Strawberry Production
• UC IPM — Pest Management Guidelines for Strawberry (UC ANR Pub. 3468)
• NC State Extension — Strawberry Disease Management
• UMass Agriculture — Strawberry IPM: Verticillium Wilt
• Garibaldi et al. 2013 — Wild Pollinators Enhance Fruit Set (Proc. Royal Society B)
• Klatt et al. 2014 — Bee Pollination Improves Strawberry Quality (Biological Conservation)
• USDA NRCS — Cover Crops Overview (PDF fact sheet)
• University of Nebraska CropWatch — Is Nitrogen Fixation Oversold with Legume Cover Crops?