Cucumber Companion Planting
Cucumis sativus
Gourd (Cucurbitaceae) -- warm season
Good Companions for Cucumber
Flowering dill attracts predatory insects (Chrysoperla spp., Coccinellidae, Syrphidae) that control cucumber beetle (Diabrotica undecimpunctata) and aphid populations on nearby cucumbers.
Plant dill near cucumbers but not too close -- mature dill allelopathy may affect adjacent plants at very close range. 30-60 cm spacing is ideal.
- Insectary strip effects on natural enemy abundance and pest control in cucurbits -- Environmental Entomology (2005)
- Habitat management for natural enemies of pests -- Annual Review of Entomology (2000)
Nasturtium serves as a trap crop for aphids (Aphis gossypii, Myzus persicae) and whiteflies, drawing them away from cucumber. Nasturtium flowers also attract aphid-eating hover flies.
Ring cucumber hills with nasturtiums. Inspect nasturtium colonies regularly and remove heavily infested plants.
- Trap Crops for Managing Insect Pests -- University of Connecticut Extension (2012)
- The role of trap cropping in vegetable pest management -- Integrated Pest Management Reviews (1998)
Radish interplanted with cucumbers acts as a trap crop for flea beetles (Phyllotreta spp.) and cucumber beetles (Diabrotica undecimpunctata). Beetles preferentially feed on radish leaves, reducing damage to cucumber seedlings.
Direct-sow radish around cucumber hills 1-2 weeks before transplanting cucumbers.
- Using radish as a trap crop for cucumber beetle management -- Journal of Economic Entomology (2006)
- Trap crops for flea beetle and cucumber beetle management -- Iowa State University Extension (2015)
Sunflowers attract pollinators (native bees, honeybees) that improve cucumber fruit set. Tall sunflower stems also serve as trellising support for vining cucumber varieties.
Plant sunflowers on bed borders. Cucurbits depend on insect pollination for fruit set -- any pollinator-attracting companion improves yield.
- Pollinator-dependent crop production and the role of wild bees -- Ecological Applications (2011)
- Insect Pollination of Cucurbits -- University of Florida IFAS Extension (2017)
Borage flowers attract pollinators essential for cucumber fruit set. Cucurbits require insect pollination and yield is directly correlated with pollinator visitation rates.
Plant borage near cucumber hills. The blue star-shaped flowers are particularly attractive to bumblebees.
- Insect Pollination of Cucurbits -- University of Florida IFAS Extension (2017)
- Insect Visitors to Flowering Herbs and Their Potential Contribution to Biocontrol -- Environmental Entomology (2003)
Zinnia flowers attract pollinators (particularly native bees and butterflies) that improve cucumber fruit set. Zinnia nectar also supports parasitoid wasps and predatory hover flies.
Plant zinnias at cucurbit bed borders. Both are warm-season crops with similar cultural requirements.
- Pollinator-dependent crop production and the role of wild bees -- Ecological Applications (2011)
- Annual flowers as floral resources for beneficial insects -- University of Minnesota Extension (2019)
Crops to Avoid Near Cucumber
Cucumbers and potatoes share susceptibility to Phytophthora infestans, and cucumber plants may serve as alternate hosts for potato-affecting strains. Proximity increases humidity and disease spread risk.
Separate in the garden layout. Ensure good air circulation around both crops.
- Phytophthora host range and crop management -- Plant Disease (2004)
- Managing Late Blight in Vegetable Gardens -- UMass Extension (2020)