What is companion planting?

Companion planting is the practice of growing certain plants near each other for mutual benefit. Some plants repel pests, attract beneficial insects, improve soil nutrients, or enhance the growth and flavor of their neighbors.

Why should I avoid planting certain plants together?

Some plants release chemicals (allelopathy) that inhibit the growth of others, compete for the same nutrients, attract the same pests, or spread diseases to each other. For example, fennel inhibits the growth of most vegetables.

What are the Three Sisters in companion planting?

The Three Sisters is a traditional Native American planting method combining corn, beans, and squash. Corn provides a structure for beans to climb, beans fix nitrogen in the soil for all three plants, and squash provides living mulch that shades the soil and deters pests.

How do marigolds help in the garden?

Marigolds are excellent companion plants because their roots release substances that kill nematodes in the soil, their strong scent repels many pests including whiteflies and beetles, and they attract beneficial insects like ladybugs.

Is this companion planting guide free to use?

Yes! This companion planting guide is completely free with no subscriptions or hidden costs. You can search plants, view compatibility information, build garden lists, and print results without creating an account.

Companion Planting Guide - Free Garden Planning Tool

Welcome to the Companion Planting Guide

Select a plant from the list to see its companions and antagonists, or build your garden to check compatibility between multiple plants.

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100+ Plants

Vegetables, herbs, and fruit trees with detailed companion info

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Scientific Reasons

Learn why plants help or hinder each other

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Compatibility Matrix

See how all your garden plants interact at a glance

Plant Name

✓ Good Companions

✗ Avoid Planting Near

📊 Garden Compatibility Matrix

Hover over cells to see why plants are compatible or incompatible.