Onions & carrots: the onions help to keep the carrot root fly at bay, while the carrots do their bit by repelling the onion fly.
Celery & brassicas (the cabbage, cauliflower and broccoli family of plants): the celery will help to minimise, though not eliminate, damage caused by white butterfly larvae.
Marigolds & beans/brassicas: the marigolds emit a natural gas which protects surrounding plants from insects like aphids and white fly; in addition, the marigold’s root system attracts nematodes and disrupts their reproductive cycle.
Basil & tomatoes: Tomatoes are susceptible
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