All three flowers are fantastic for attracting beneficial insects and repelling tomato pests
Planting basil with tomatoes can help reduce damage from tomato pests like thrips, hornworms, whiteflies, and aphids
Onions strong aroma helps defend tomatoes against pests like aphids, mites, and flea beetles. As root crops, they also maximize space.
All three herbs will help reduce damage from pests by attracting beneificial insects like lacewings and parasitic wasps. Chives also help repel aphids and mites.
Planting tomatoes with carrots and radishes maximizes space, improves the soil, and may reduce pest damage to both plants.
Borage attracts pollinators and beneficial insects, both of which will help improve tomato yields. It's also a good trap crop for aphids.
for more tomato growing tips + what not to plant with tomatoes