The good neighbor policy of plants is:
“We solemnly vow to help other plants by attracting beneficial insects and repelling harmful ones.”
So, to help further their policy, you can:
Plant marigolds to keep away beetles, nematodes, and other pests.
Plant nasturtiums, mint, and basil to attract beneficial bugs and keep away mosquitoes, flies, and other pests.
Plant purple drumstick alliums or catmint to prevent aphids, mites, black spot, and powdery mildew from attacking roses.
Based on an article in AmericanProfile.com