Cut flowers end up in your home, so keeping pest control organic and non-toxic is particularly important. Most cut flower pest problems can be managed with prevention, beneficial insects, and targeted organic treatments.
Aphids are the most common pest across nearly all cut flowers. Japanese beetles target dahlias and zinnias. Slugs attack young seedlings, especially in spring. Spider mites appear in hot, dry weather on dahlias and marigolds. Caterpillars can defoliate certain plants overnight.
Healthy plants resist pests better. Good soil, proper spacing for air circulation, and consistent watering all reduce pest pressure. Companion planting with herbs like basil and mint can deter some pests. Marigolds are well-known for repelling soil nematodes.
Insecticidal soap controls aphids and soft-bodied insects on contact. Neem oil is effective against a wide range of pests. Bacillus thuringiensis (Bt) targets caterpillars specifically. Diatomaceous earth deters slugs. Hand-picking Japanese beetles (early morning when they are sluggish) into soapy water is surprisingly effective.
Attract or purchase ladybugs (eat aphids), lacewings (eat aphids and mites), and parasitic wasps (control caterpillars). Planting small-flowered herbs and flowers provides habitat for beneficials. For more information, the Xerces Society has excellent resources on supporting beneficial insects.