Euphorbia (Snow-on-the-Mountain) in Zone 10a & 10b
Euphorbia marginata
When to plant euphorbia (snow-on-the-mountain) in zone 10b
Zones 10a and 10b share the same average frost dates in our data, so this page covers both.
Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Euphorbia (Snow-on-the-Mountain) tolerates either.
| Start indoors | Dec 26–Jan 2 '27 |
|---|---|
| Direct sow / transplant outside | Jan 30–Feb 6 |
| Estimated bloom | Apr 20–Apr 27 (~80 days after planting) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.

Euphorbia, commonly called snow-on-the-mountain, is grown for its white-margined bracts that look frosted even in the height of summer heat, an unusual filler for a bouquet or used as annual hedging along a border.
How euphorbia (snow-on-the-mountain) fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Euphorbia (Snow-on-the-Mountain) needs about 80 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Euphorbia (Snow-on-the-Mountain).
Where to buy euphorbia seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing euphorbia (snow-on-the-mountain)" 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 Euphorbia (Snow-on-the-Mountain) in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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