100% Tomato Focused.   Science-backed.   Practical.
Trusted by 100,000+ growers worldwide
KnowTomato Logo
FREE TOOL

Tomato Companion Plants Checker: What Grows Well with Tomatoes

Pick any plant and instantly see whether it belongs next to your tomatoes, with the reason why. Good neighbors, bad neighbors, and the ones that do not matter either way.

Tomato Companion Planting Guide

Search any plant to see whether it helps your tomatoes or hurts them, and exactly why. Filter to what to plant nearby or what to keep away.

Companion planting mixes solid science (marigolds really do suppress nematodes) with a lot of old-timer tradition. Treat the positives as gentle bonuses, not magic, and take the plants to keep apart more seriously, since those are about real competition and shared diseases.
The quick version: basil, marigolds, alliums like onion and garlic, leafy greens, carrots, and flowering herbs are all good tomato neighbors. Keep tomatoes away from all brassicas (broccoli, cabbage, kale), corn, fennel, and above all potatoes, which share the same blights. The checker above covers nearly thirty common garden plants with the reasoning behind each verdict.
KnowTomato
Explore All Tools →