Companion Plants for Strawberries

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Pests are attracted to garden strawberries (Fragaria x ananassa) as much as people are, but companion plants help keep pests at bay. Strawberries grow as perennials in U.S. Department of Agriculture plant hardiness zones 5 through 8 and as annuals in warmer zones. Companion plants for strawberries deter and distract pests, and host beneficial insects, but they don't compete with strawberries for light or nutrients. Space strawberries and their companions according to their final growth dimensions.

Herb Choices

  • Strawberries thrive in gardens with annual and perennial herb companions. Borage (Borago officinalis) helps strawberries resist insects and diseases, and common thyme (Thymus vulgaris) deters worms, according to a Michigan State University Extension in Kalamazoo County article. Borage is an annual herb that grows 12 to 36 inches tall and 9 to 18 inches wide; it bears bright-blue, star-shaped flowers in summer. Common thyme, which is hardy in USDA zones 5 through 9, grows 6 to 12 inches tall and wide, and bears tiny, lilac flowers from late spring through early summer. Another herb companion for strawberries is oregano (Origanum vulgare). Hardy in USDA zones 4 through 9, oregano varieties range from low, spreading mats to upright, bushes. They bear pink, purple or white flowers.

Vegetable Selections

  • In the vegetable patch, strawberries' companion plants include onion (Allium cepa), lettuce (Lactuca sativa) and spinach (Spinacia oleracea). Growing 12 to 18 inches tall and 6 to 12 inches wide, onion is grown for its flavorful, aromatic bulbs and leaves; it is harvested as an annual crop. Lettuce and spinach grow 6 to 12 inches tall and wide; they are annual plants. Lettuce varieties include romaine, iceberg, loose leaf and butterhead. A cool-weather vegetable, spinach is an upright plant with leaves rich in iron, phosphorus and vitamins A, B and C. Grow strawberries and vegetable companion plants in alternate rows for their maximum benefit.

Annual Flowering Varieties

  • Annual flowering plants attract beneficial insects to strawberries they are near. Nasturtium (Tropaeolum spp.) grows 1 to 10 feet tall and 1 to 3 feet wide, depending on the species and cultivar, and bears cream, yellow, orange or red flowers with a spicy fragrance in spring through fall. Marigold (Calendula officinalis), growing 1 to 2 feet tall and wide, bears chrysanthemum-resembling, deep-orange to yellow, early summer flowers that bloom through fall in cool climates. Both of these annuals grow readily from seeds sown directly in the ground just before the average final frost date, and they reseed in favorable conditions.

Perennial Flowering Options

  • Strawberries are productive ground-cover plants in garden borders with perennial companions. Pincushion flower "Butterfly Blue" (Scabiosa "Butterfly Blue") and speedwell "Foxy Lady" (Veronica "Foxy Lady") thrive in the same full-sun sites and moist, well-drained soil in which strawberries do well. Hardy in USDA zones 5 through 9, "Butterfly Blue" grows 12 to 18 inches tall and wide. It bears 2-inch, lavender-blue, pincushionlike flowers spring through fall and into winter in mild climates. "Foxy Lady," which is hardy in USDA zones 4 through 8, grows 12 to 18 inches tall and 9 to 12 inches wide. It produces 12- to 15-inch spikes of fuschia-pink and white flowers in summer.

References

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