Companion Planting Guide

Companion planting is the practice of growing certain plants near each other for mutual benefit. Some combinations repel pests, improve pollination, enhance flavor, or provide structural support. For example, basil planted near tomatoes repels aphids and may improve tomato flavor.

Avoid planting brassicas (cabbage, broccoli, cauliflower), fennel, and dill near tomatoes. Brassicas can stunt tomato growth, fennel inhibits most garden plants, and mature dill can reduce tomato production. Also keep tomatoes away from walnuts due to juglone toxicity.

Yes. French marigolds release compounds that repel nematodes, whiteflies, and aphids. They also attract beneficial insects like hoverflies and ladybugs. Plant them as borders around vegetable beds for the best pest-deterrent effect.

Classic combinations include tomatoes with basil, carrots with onions, corn with beans and squash (the Three Sisters), cucumbers with dill, and lettuce with chives. Our guide shows compatible and incompatible pairs for dozens of common garden plants.

Companion plants should be within 2-3 feet of each other for most pest-deterrent benefits. For pollination benefits, plant flowers within the same bed or border. Avoid planting companions so close that they compete for light, water, or nutrients.