Phlox (Annual) in Zone 11a & 11b
Phlox drummondii
When to plant phlox (annual) in zone 11b
Zones 11a and 11b 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. Phlox (Annual) tolerates either.
| Start indoors | Nov 27–Dec 4 |
|---|---|
| Direct sow / transplant outside | Dec 25–Jan 1 '27 |
| Estimated bloom | Mar 5 '27–Mar 12 '27 (~70 days after planting) |
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 0.5-1.5 ft.
Annual phlox is a compact, fast, and easy bedding flower in unusually bright, saturated colors, worth telling apart from the taller, perennial garden phlox that shares the common name but grows and behaves quite differently.
How phlox (annual) fits zone 11's season
Zone 11b is frost-free in this dataset, so frost is not what limits the calendar here. What you can plant, and when, comes down to summer heat and daylength instead.
Good companions
No standout companions recorded yet for Phlox (Annual).
Where to buy phlox seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing phlox (annual)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 11b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Phlox (Annual) in USDA zone 11b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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