Q: I have black aphids on my garlic chives. They can be washed off but come right back. How do I get rid of them?
A: I guess you could use store-bought insecticidal soap on them, but spraying with a garden hose works about as well and doesn’t cost as much.
Aphids are not great crawlers, so even though they seem to come right back, the ones you knock off are usually eaten by predators. The aphids that seem to return are small ones that were hiding at the base of the plant when you sprayed.