---
title: Companion Planting Guide
created: 2026-05-24
updated: 2026-05-24
type: concept
tags: [companion, planting, pest-control, garden-design]
sources: [entities/*.md]
---
# Companion Planting Guide
## Overview
Plants that benefit each other when grown together. Extracted from SeedVault product data and general horticultural knowledge.
## Companion Pairings by Crop
### Root Vegetables
| Crop | Good Companions | Why |
|------|----------------|-----|
| [[scarlett-nantes-carrot]] | Aromatic herbs, onions | Repel carrot flies |
| [[snowball-turnips]] | Beans, peas, lettuce | Share soil depth, complementary nutrients |
| [[bulls-blood-beets]] | Onions, lettuce, cabbage | Onions repel pests, beets don't compete |
| [[sugar-beets]] | Beans, peas, onions | Nitrogen fixers + pest repelling |
### Leafy Greens
| Crop | Good Companions | Why |
|------|----------------|-----|
| [[butter-crunch-butterhead-lettuce]] | Onions, cucumbers, carrots | Shallow roots share space well |
| [[red-russian-kale]] | Cabbage, potatoes | Same family benefits, shared pest management |
| [[utah-celery]] | Tomatoes, carrots, lettuce | Different root zones, shared moisture needs |
### Legumes
| Crop | Good Companions | Why |
|------|----------------|-----|
| [[provider-green-bush-beans]] | Carrots, corn, cucumbers | Beans fix nitrogen for neighbors |
| [[sugar-lace-snap-peas]] | Carrots, radishes, beets | Early season nitrogen fixers |
### Fruitng Vegetables
| Crop | Good Companions | Why |
|------|----------------|-----|
| [[jack-o-lantern-pumpkin]] | Corn | Three Sisters method — corn supports, beans fix N |
| [[dark-green-zucchini-squash]] | Beans, corn, cucumbers | Squash family shares companions |
| [[pickling-cucumber]] | Beans, peas, corn, lettuce | Beans fix nitrogen, lettuce shares shallow roots |
| [[roma-tomatoes]] | Basil, carrots, peppers, lettuce | Basil repels tomato hornworms |
| [[california-wonder-sweet-pepper]] | Tomatoes, basil, carrots | Shared pest profile, similar needs |
| [[jalapeno-peppers]] | Tomatoes, basil, onions | Shared season, basil deters pests |
### Herbs
| Crop | Good Companions | Why |
|------|----------------|-----|
| [[parsley]] | Tomatoes, asparagus | Repels asparagus beetles, tomato hornworms |
| [[large-leaf-basil]] | Tomatoes, peppers | Repels hornworms, thrips, mosquitoes |
| [[coriander-cilantro]] | Beans, brassicas, cucumbers | Attracts beneficial insects |
| [[catnip-herb]] | General garden | Attracts pollinators, aids pollination |
### Onions
| Crop | Good Companions | Why |
|------|----------------|-----|
| [[white-bunching-onion]] | Cabbage family, lettuce, tomatoes | Repel pests across multiple families |
## Classic Combinations
### Three Sisters
- Corn + Beans + Squash/Pumpkin
- Corn provides structure, beans fix nitrogen, squash suppresses weeds
- Products: [[yellow-dent-corn]] + [[provider-green-bush-beans]] + [[dark-green-zucchini-squash]] or [[jack-o-lantern-pumpkin]]
### Salad Bowl
- Lettuce + Radish/Carrots + Herbs
- All shallow-rooted, fast-growing
- Products: [[butter-crunch-butterhead-lettuce]] + [[scarlett-nantes-carrot]] + [[large-leaf-basil]] + [[coriander-cilantro]]
### Mediterranean Bed
- Tomatoes + Basil + Peppers + Carrots
- Warm-season companions with shared pest management
- Products: [[roma-tomatoes]] + [[large-leaf-basil]] + [[jalapeno-peppers]] or [[california-wonder-sweet-pepper]] + [[scarlett-nantes-carrot]]
### Cool Season Mix
- Kale + Beans + Turnips + Onions
- Cold-tolerant, early harvest
- Products: [[red-russian-kale]] + [[sugar-lace-snap-peas]] + [[snowball-turnips]] + [[white-bunching-onion]]
## Plants to Avoid Together
| Avoid | Reason |
|-------|--------|
| Tomatoes + Brassicas (kale, brussels sprouts) | Compete for nutrients, attract shared pests |
| Beans + Onions/Garlic | Alliums inhibit nitrogen-fixing bacteria on bean roots |
| Squash + Potatoes | Same family (nightshades/solanaceae), share blight disease |
| Corn + Tomatoes | Both heavy feeders, attract earworm/tomato hornworm |
## Related
- [[seed-catalog]]
- [[planting-schedules]]
- [[grow-guides]]