Osteospermum in Zone 4a & 4b
Osteospermum ecklonis
When to plant osteospermum in zone 4b
Zones 4a and 4b share the same average frost dates in our data, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. Osteospermum needs a head start most zones can't give it by direct-sowing alone.
| Start indoors | Mar 20–Mar 27 |
|---|---|
| Direct sow / transplant outside | May 22–May 29 |
| Estimated bloom | Aug 20–Aug 27 (~90 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-3 ft.
Two different plants are sold as African daisy, and knowing which you have decides how you treat it.
How osteospermum fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Osteospermum needs about 90 days from transplant to first harvest.
Good companions
No standout companions recorded yet for Osteospermum.
Where to buy osteospermum seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing osteospermum" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 4b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Osteospermum in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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