Companion Plants for Radishes
Traditional companions for radishes include bell peppers, broccoli, Brussels sprouts, bush beans, cabbage, carrots and 16 more in the table below.
These are garden traditions, collected from 13 US extension guides. Few have been tested in trials, so treat them as a starting point: spacing, sun and rotation matter more.
Good companions for radishes
Spacing is per square foot, for a raised bed planted square by square. Cool-season companions can share the bed before or after a warm-season crop, or grow in its shade.
| Plant | Kind | Spacing | Season |
|---|---|---|---|
| Bell Peppers | Vegetable | 1 per sq ft | Warm season |
| Broccoli | Vegetable | 1 per sq ft | Cool season |
| Brussels Sprouts | Vegetable | 1 per sq ft | Cool season |
| Bush Beans | Vegetable | 9 per sq ft | Warm season |
| Cabbage | Vegetable | 1 per sq ft | Cool season |
| Carrots | Vegetable | 16 per sq ft | Cool season |
| Cauliflower | Vegetable | 1 per sq ft | Cool season |
| Collard Greens | Vegetable | 1 per sq ft | Cool season |
| Cucumbers | Vegetable | 2 per sq ft | Warm season |
| Head Lettuce | Vegetable | 1 per sq ft | Cool season |
| Hot Peppers | Vegetable | 1 per sq ft | Warm season |
| Kale | Vegetable | 1 per sq ft | Cool season |
| Kohlrabi | Vegetable | 4 per sq ft | Cool season |
| Leaf Lettuce | Vegetable | 4 per sq ft | Cool season |
| Peas | Vegetable | 8 per sq ft | Cool season |
| Pole Beans | Vegetable | 8 per sq ft | Warm season |
| Romaine Lettuce | Vegetable | 1 per sq ft | Cool season |
| Salad Mix | Vegetable | 16 per sq ft | Cool season |
| Spinach | Vegetable | 9 per sq ft | Cool season |
| Zucchini and Summer Squash | Vegetable | 1 per 4 sq ft | Warm season |
| Winter Squash | Vegetable | 1 per 2 sq ft | Warm season |
| Nasturtiums | Flower | 1 per sq ft | Warm season |
What the evidence says
Companion planting charts come from long garden experience, and most pairs have never been tried in a replicated trial. Several extension services say so directly; one review gives traditional charts more entertainment than scientific value.
What reliably helps radishes: the right planting dates, enough space, and moving crops to a new bed each year (crop rotation).
Plant them side by side
Draw your beds, tap squares to plant radishes next to their companions, and get every crop's planting dates for your ZIP code. Free, in your browser.
Questions
What can I plant with radishes?
The traditional companions are bell peppers, broccoli, Brussels sprouts, bush beans, cabbage, carrots, cauliflower, collard greens and 14 more listed above. Plant companions in neighbouring rows or squares rather than in the same hole.
Does companion planting with radishes work?
Most pairings are tradition rather than tested results: extension services call companion planting promising but largely unproven. None of the pairs for this crop has been tested in a trial we could find. Good spacing, sun, water and rotation do more for a harvest than any single pairing.
How close can nasturtiums grow to radishes?
In a raised bed planted by the square foot, give radishes 16 per sq ft and nasturtiums 1 per sq ft, in neighbouring squares. In rows, radishes need 2 in between plants.
More companion plants
Sources
- UC Master Gardener Program, UC ANR: Companion Planting Chart: Companion Planting for Edible Crops
- University of Wisconsin–Madison Extension, Kenosha County: Companion Plants for the Vegetable Garden (column, 2012)
- Oregon State University Extension Service: Companion Planting (Food Hero, 2021)
- Oregon State University Extension Service: Herbs and Flowers in the Vegetable Garden
- Utah State University Extension, Utah 4-H: Creating Sustainable School and Home Gardens: Companion Planting (2025)
- Penn State Extension: Herbs Make Good Plant Partners and Companions
- SDSU Extension: Square-Foot Garden Sample Planting Layout (P-00379, 2026)
- University of Arizona Cooperative Extension, Yavapai County: The Art of Companion Planting (Master Gardener presentation, 2023)
- Clemson Cooperative Extension HGIC: Plant Partners: 5 Benefits of Companion Planting (2025)
- N.C. A&T State University Cooperative Extension: Five Veggies You Can Grow at Home
- University of Vermont Extension: Creating a Biodiverse Vegetable Garden (2023)
- UF/IFAS Florida-Friendly Landscaping Program: Companion Planting (FFL in a Minute, 2020)
- WSU Extension Skagit County Master Gardeners: Trap Cropping (2020)