Gomphrena (Globe Amaranth) in Zone 10a & 10b
Gomphrena globosa
When to plant gomphrena (globe amaranth) in zone 10b
Zones 10a and 10b share the same average frost dates in our data, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. Gomphrena (Globe Amaranth) needs a head start most zones can't give it by direct-sowing alone.
| Window | Spring window |
|---|---|
| Start indoors | Jan–May |
| Direct sow / transplant outside | Mar–Jul |
| Estimated bloom | May 30–Oct 29 (~90 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Zone 10b dates sourced from growinginthegarden.com.
Gomphrena (globe amaranth) grows a long taproot that gives it above-average drought tolerance once established, and it rewards that patience with one of the longest bloom windows of any flower on this list: April through October in a lot of climates. What look like its "flowers" are papery bracts, not petals, which is why cut stems hung upside down hold their color and shape for months in a dried arrangement instead of shattering the way true petals do.
How gomphrena (globe amaranth) fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Gomphrena (Globe Amaranth) needs about 90 days from transplant to first harvest.
Good companions
No standout companions recorded yet for Gomphrena (Globe Amaranth).
Where to buy gomphrena seeds
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See it growing
Search YouTube for "growing gomphrena (globe amaranth)" 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 Gomphrena (Globe Amaranth) in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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