Bupleurum (Thoroughwax) in Zone 10a & 10b
Bupleurum rotundifolium
When to plant bupleurum (thoroughwax) 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. Bupleurum (Thoroughwax) tolerates either.
| Start indoors | Dec 12–Dec 19 |
|---|---|
| Direct sow / transplant outside | Jan 16–Jan 23 |
| Estimated bloom | Apr 16–Apr 23 (~90 days after planting) |
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
Bupleurum, also called thoroughwax, is a chartreuse-toned filler flower that reads more like foliage than bloom in a bouquet, useful for softening bolder cut flowers without pulling attention away from them.
How bupleurum (thoroughwax) fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Bupleurum (Thoroughwax) needs about 90 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Bupleurum (Thoroughwax).
Where to buy bupleurum seeds
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See it growing
Search YouTube for "growing bupleurum (thoroughwax)" 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 Bupleurum (Thoroughwax) in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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