What Not to Plant with Strawberries: Avoid These 7 Plants

By Tom Anderson · February 26, 2026

When growing strawberries, avoid planting them near cabbage, broccoli, cauliflower, tomatoes, potatoes, eggplants, fennel, and melons, as these plants can hinder growth, spread diseases, or attract harmful pests.

Why Proper Companion Planting Matters for Strawberries

Strawberries thrive when grown with compatible companions that enhance soil health, deter pests, and maximize space. However, certain plants release chemicals, compete aggressively, or harbor pathogens that negatively impact strawberry plants. Choosing the wrong neighbors can reduce yield, invite disease, and weaken plant vitality.

Plants That Harm Strawberry Growth

Avoid these common garden plants when planning your strawberry beds:

Cabbage, Broccoli, Cauliflower (Brassicas): These heavy feeders deplete soil nutrients needed by strawberries and may increase susceptibility to pests like aphids.
Tomatoes, Potatoes, Eggplants (Nightshades): Share common diseases such as verticillium wilt, which can persist in soil and devastate strawberry crops.
Fennel: Releases allelopathic compounds that inhibit the growth of many plants, including strawberries.
Melons and Squash: Compete for space and moisture; their sprawling vines can shade out strawberry plants.
Walnut Trees (Black Walnut): Emit juglone, a toxin harmful to strawberries and many other plants.

Common Problems from Incompatible Companions

Disease Transmission

Nightshade family members are notorious carriers of Verticillium dahliae, a soil-borne fungus causing wilting and death in strawberries. Once infected, soil remains contaminated for years.

Nutrient Competition

Brassicas have deep root systems and high nitrogen demands, leaving strawberries nutrient-deficient and stunted.

Chemical Inhibition

Fennel produces substances that disrupt cell division in nearby plants, leading to poor germination and weak growth in strawberries.

Companion Planting Data: Impact on Strawberry Yield

Companion Plant	Effect on Strawberries	Yield Reduction (%)	Primary Risk
Tomato	Negative	40–60	Verticillium wilt
Cabbage	Negative	30–50	Nutrient competition
Fennel	Negative	50–70	Allelopathic inhibition
Marigold (companion)	Positive	+20–30	Pest suppression
Borage (companion)	Positive	+25–35	Pollination & growth boost

Table data source:1, 2, 3

The data shows that incompatible companions like tomatoes and fennel can reduce strawberry yields by up to 70%. In contrast, beneficial companions improve yield through pest control and enhanced pollination. Avoiding negative pairings is critical for long-term bed productivity.

Best Practices for Strawberry Garden Planning

To protect your strawberry patch:

Rotate planting sites every 3–4 years to prevent soil-borne disease buildup.
Use raised beds or containers if growing near unsuitable plants.
Introduce positive companions like borage, thyme, chives, or marigolds to repel pests and improve flavor.
Keep at least 3 feet of separation between strawberries and nightshades or brassicas.

Frequently Asked Questions About Strawberry Companion Planting

Can I plant strawberries near tomatoes?

No, avoid planting strawberries near tomatoes. Both are susceptible to verticillium wilt, a persistent soil fungus that can destroy entire crops. Even crop rotation may not eliminate the risk if tomatoes were previously grown in the same area.

Why is fennel bad for strawberries?

Fennel releases natural chemicals that inhibit the growth of many plants, including strawberries. This phenomenon, known as allelopathy, can result in poor germination, stunted growth, and reduced fruit production.

What vegetables should not be planted with strawberries?

Do not plant brassicas (cabbage, broccoli, kale) or nightshades (tomatoes, peppers, eggplants) with strawberries. These plants either compete heavily for nutrients or share damaging diseases that affect strawberry health.

Can strawberries be planted near herbs?

Yes, many herbs are excellent companions. Borage deters pests and boosts growth, while thyme and chives improve flavor and repel insects. However, avoid planting near strong allelopathic herbs like fennel or rue.

How far apart should strawberries and incompatible plants be spaced?

Maintain a minimum distance of 3 feet between strawberries and incompatible plants. For larger growers like squash or tomatoes, increase spacing to 4–5 feet or use physical barriers like raised beds to reduce shared root zone risks.