Companions
Dill, Beetroot, Carrot, Chamomile, Coriander, Cucumber, Beans, Lettuce, Lovage, Marjoram, Marigold, Mint, Nasturtium, Peas, Rosemary, Sage, Tansy, Thyme, Tomato and Zinnia.
Troubleshooting
Use fine mesh or exclusion netting over spring to prevent butterflies laying eggs on the underside of leaves - caterpillars can destroy these plants.