Q How do I treat the sacrificial nasturtiums that are keeping blackfly away from my veg? HEATHER BROTHWELL, BY EMAIL
A Nasturtiums not only attract blackfly, but also cabbage white caterpillars, so they’re very useful decoy plants. When covered in the pests, pull up the plants and place them in an enclosed compost bin. This will stop them attacking your crops.
Compost pest-covered nasturtiums