Nasturtium in Zone 10a & 10b
Tropaeolum majus
Yes, nasturtium grows in zones 10a and 10b. Plant it outside in Oct–Jan. For a fall crop, plant out in Oct–Jan.
When to plant nasturtium in zone 10b
Zones 10a and 10b share the same average frost dates, so this page covers both.
Method: Direct sow: Direct-sow outside. It 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 | ~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.
Fall window: the last sowing date is the average first frost minus days to maturity, the method in Purdue Extension's fall garden guide, which lists nasturtium for late-summer planting.
Plant alongside it in zone 10b
These go outside within two weeks of nasturtium in zone 10b, so one planting day can cover them.
- Black-Eyed SusanOct–Mar
- HollyhockOct–Mar
- Love-in-a-Mist (Nigella)Oct–Mar
- Pansy / ViolaOct–Jan
- RanunculusOct–Nov
- StrawflowerOct–Feb
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 bloom.
Nasturtium planting windows in every zone
Zone 10b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Bloom |
|---|---|---|---|
| 2a & 2b | Not usually | May 27–Jun 3 | Jul 21–Jul 28 |
| 3a & 3b | Not usually | Jun 6–Jun 13 | Jul 31–Aug 7 |
| 4a & 4b | Not usually | May 22–May 29 | Jul 16–Jul 23 |
| 5a & 5b | Not usually | May 17–May 24 | Jul 11–Jul 18 |
| 6a & 6b | Not usually | May 2–May 9 | Jun 26–Jul 3 |
| 7a & 7b | Not usually | Apr 17–Apr 24 | Jun 11–Jun 18 |
| 8a & 8b | Not usually | Apr 1–Apr 8 | May 26–Jun 2 |
| 9a & 9b | Not usually | Feb 22–Mar 1 | Apr 18–Apr 25 |
| 10a & 10bFall window (your zone) | Not usually | Oct–Jan | ~55 days after direct-sowing |
| 11a & 11b | Not usually | Jan 8–Jan 15 | Mar 4–Mar 11 |
Bloom dates are about 55 days after the sow or plant-out date.
Zone 2 sows before zone 3 here, which looks wrong and is not. USDA zones rank winter cold, not season length, and zone 2 is mostly interior Alaska, where hard winters come with warm summers. More on what a zone measures.
Good companions
- Zucchini: Trap crop for aphids, drawing them away from squash.
Where to buy nasturtium seeds
Botanical Interests · True Leaf Market · Burpee · High Mowing Organic Seeds (each supplier's nasturtium seeds)
Varieties we recommend, and where to get them:
- Empress of India (Tropaeolum majus): A compact, mounded type rather than a trailing one. If the point of planting it is to sit near squash and take the aphid hit, a plant that stays put at 16 to 20 inches does that job without swallowing the bed the way a trailing variety would. Buy: True Leaf Market · Burpee · High Mowing Organic Seeds Full notes
- Alaska Mix: Johnny's Alaska Mix has green-and-white variegated foliage, so the plant itself is decorative even before it blooms, unlike Empress of India's plain dark leaves. Buy: True Leaf Market · Burpee · High Mowing Organic Seeds Full notes
- Jewel Mix: Johnny's Jewel Mix includes both single and double blooms in red, pink, orange, and yellow at a slightly taller 16 inches, against Empress of India's single-form flowers and Alaska's variegated leaves. Buy: True Leaf Market Full notes
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 · 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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