Before planting cauliflower seedlings, consider pest prevention. Immediately after transplanting, cover the plant with floating row covers; these physical barriers will help deter both cabbage moths and flea beetles. I usually secure the edges with soil or rocks to get a nice, tight seal, which prevents virtually all insect infestations.
Companion Planting
- Thyme repels cabbage worms with aromatic oils
- Rosemary confuses flea beetles with strong scent
- Nasturtiums lure aphids away from cauliflower
- Mint deters ants but requires container planting
Spray Applications
- Neem oil disrupts feeding for soft-bodied insects
- Insecticidal soap suffocates aphids on contact
- Garlic spray repels multiple pests simultaneously
- Apply early morning for maximum effectiveness
Diatomaceous earth barriers: sprinkling this powder around the base of your plants creates a barrier that particulates dehydrate soft-bodied insects. I apply a 1-inch wide ring of the powder after watering. Now as it rains (or you are irrigating) the powder cover is disturbed. Respray post-rain/ irrigation. I use food grade for safety, and find this works better for slugs and crawling critters.
Biological Controls
- Release ladybugs for aphid control every 2 weeks
- Apply Bt (Bacillus thuringiensis) for caterpillars
- Introduce parasitic wasps for cabbage worms
- Encourage birds with nearby feeders
Cultural Practices
- Rotate crops yearly to disrupt pest cycles
- Remove plant debris where pests overwinter
- Use yellow sticky traps for flying insects
- Time planting to avoid pest life cycles
Monitor plants every three days. Check the undersides of leaves for eggs and young nymphs. I pick off the larger insects, using my glass for the tiny ones. One can usually catch the pests as youngsters before they start a pestiferous career.
Read the full article: When to Plant Cauliflower: Expert Timing Guide
