Companion Plants for Nasturtiums
Traditional companions for nasturtiums include broccoli, Brussels sprouts, cantaloupe, cauliflower, celery, cherry tomatoes and 11 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 nasturtiums
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 |
|---|---|---|---|
| Broccoli | Vegetable | 1 per sq ft | Cool season |
| Brussels Sprouts | Vegetable | 1 per sq ft | Cool season |
| Cauliflower | Vegetable | 1 per sq ft | Cool season |
| Celery | Vegetable | 1 per sq ft | Cool season |
| Cherry Tomatoes | Vegetable | 1 per sq ft | Warm season |
| Collard Greens | Vegetable | 1 per sq ft | Cool season |
| Cucumbers | Vegetable | 2 per sq ft | Warm season |
| Kale | Vegetable | 1 per sq ft | Cool season |
| Kohlrabi | Vegetable | 4 per sq ft | Cool season |
| Peas | Vegetable | 8 per sq ft | Cool season |
| Pumpkins | Vegetable | 1 per 9 sq ft | Warm season |
| Radishes | Vegetable | 16 per sq ft | Cool season |
| Zucchini and Summer Squash | Vegetable | 1 per 4 sq ft | Warm season |
| Tomatoes | Vegetable | 1 per sq ft | Warm season |
| Winter Squash | Vegetable | 1 per 2 sq ft | Warm season |
| Cantaloupe | Fruit | 1 per 4 sq ft | Warm season |
| Watermelon | Fruit | 1 per 4 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.
Planting nasturtiums with zucchini and summer squash has some trial support (the University of Arizona Extension).
What reliably helps nasturtiums: 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 nasturtiums 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 nasturtiums?
The traditional companions are broccoli, Brussels sprouts, cantaloupe, cauliflower, celery, cherry tomatoes, collard greens, cucumbers and 9 more listed above. Plant companions in neighbouring rows or squares rather than in the same hole.
Does companion planting with nasturtiums work?
Most pairings are tradition rather than tested results: extension services call companion planting promising but largely unproven. Planting nasturtiums with zucchini and summer squash has some trial support (the University of Arizona Extension). Good spacing, sun, water and rotation do more for a harvest than any single pairing.
How close can broccoli grow to nasturtiums?
In a raised bed planted by the square foot, give nasturtiums 1 per sq ft and broccoli 1 per sq ft, in neighbouring squares. In rows, nasturtiums need 10 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)