Nasturtium in Zone 10a & 10b
Tropaeolum majus
When to plant nasturtium in zone 10b
Zones 10a and 10b share the same average frost dates in our data, so this page covers both.
Method: Direct sow: Direct-sow outside. Nasturtium doesn't transplant well, or doesn't need the extra time indoors.
| Window | Fall window |
|---|---|
| Start indoors | Not typically started indoors |
| Direct sow / transplant outside | Oct–Jan |
| Estimated bloom | Nov 25–Mar 27 '27 (~55 days after direct-sowing) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-1.5 ft.
Zone 10b dates sourced from growinginthegarden.com.
Nasturtium is one of the few flowers in a vegetable garden that earns its space with an actual job: round, lily-pad leaves and funnel-shaped blooms in orange, yellow, red, or cream, on a plant that's either a tidy 6-inch bush or a trailing vine running several feet, depending on which type you bought. Both the peppery leaves and the flowers are edible, and the plant is widely used as a trap crop, luring aphids onto itself and away from more valuable neighbors.
How nasturtium fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Nasturtium needs about 55 days from sowing to first harvest.
Good companions
- Zucchini: Trap crop for aphids, drawing them away from squash.
Where to buy nasturtium seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing nasturtium" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 10b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Nasturtium in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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