Zucchini and summer squash companion plants
Zucchini (*Cucurbita pepo*) and other summer squash are among the most productive vegetables in the home garden -- and among the most pest-prone. Three problems define the zucchini growing season in most regions: squash vine borer (*Melittia cucurbitae*) girdling the crown, cucumber beetles.
Zucchini (Cucurbita pepo) and other summer squash are among the most productive vegetables in the home garden — and among the most pest-prone. Three problems define the zucchini growing season in most regions: squash vine borer (Melittia cucurbitae) girdling the crown, cucumber beetles transmitting bacterial wilt, and incomplete pollination producing hollow or misshapen fruit.
Companion planting addresses the pollination and cucumber beetle problems with moderate success. Squash vine borer is best managed through timing and exclusion rather than companion plants.
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The companion planting table
| Plant | Role | Friend / Foe / Neutral | Notes |
|---|---|---|---|
| Borage (Borago officinalis) | Bee attractor; anecdotal squash bug deterrent | Friend | Flowers before and during squash bloom |
| Nasturtium (Tropaeolum majus) | Aphid trap crop; attracts pollinators | Friend | Monitor weekly |
| Sweet alyssum (Lobularia maritima) | Syrphid fly support; living mulch | Friend | Plant along row edges |
| Dill (Anethum graveolens) | Attracts beneficial wasps | Friend | Allow to flower |
| French marigold (Tagetes patula) | Beneficial insects; nematode management in soil | Friend | Bed edges and paths |
| Beans (pole or bush) | Nitrogen fixation in soil; no pest interaction | Neutral | Traditional Three Sisters component |
| Corn | Structural support for pole beans; shades roots | Neutral | Traditional Three Sisters; no documented pest benefit for squash |
| Radish | Early-season companion; possible cucumber beetle deterrence | Friend (tentative) | Harvest before squash sprawls |
| Sunflower | Attracts pollinators on north side | Neutral | Keep at least 36 inches from squash crown |
| Fennel (Foeniculum vulgare) | Allelopathic to squash | Foe | Do not plant within 20 feet |
| Cucumbers / other cucurbits | Shares all major pest species | Foe (pest amplifier) | Disperse across the garden |
| Potatoes | Shares some soilborne pathogens; no companion benefit | Foe | Separate from cucurbits |