Saponaria (Soapwort) in Zone 7a & 7b
Saponaria vaccaria
When to plant saponaria (soapwort) in zone 7b
Zones 7a and 7b 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. Saponaria (Soapwort) tolerates either.
| Start indoors | Mar 20–Mar 27 |
|---|---|
| Direct sow / transplant outside | Mar 20–Mar 27 |
| Estimated bloom | May 29–Jun 5 (~70 days after planting) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Saponaria, also called soapwort, is a cottage-garden cut-flower filler, airy and sturdy in a way that makes it a reliable bouquet component even for a first-time cut-flower grower.
How saponaria (soapwort) fits zone 7's season
Zone 7b's frost-free window runs about 198 days, from April 10 to October 25. Saponaria (Soapwort) needs about 70 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Saponaria (Soapwort).
Where to buy saponaria seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing saponaria (soapwort)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 7b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Saponaria (Soapwort) in USDA zone 7b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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