California Bluebell in Zone 4a & 4b
Phacelia campanularia
When to plant california bluebell in zone 4b
Zones 4a and 4b share the same average frost dates in our data, so this page covers both.
Method: Direct sow: Direct-sow outside. California Bluebell doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | May 15–May 22 |
| Estimated bloom | Jul 24–Jul 31 (~70 days after direct-sowing) |
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
California bluebell is a desert native that flowers hard for about a month and then finishes, which makes it a spring crop rather than a summer one.
How california bluebell fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. California Bluebell needs about 70 days from sowing to first harvest.
Good companions
No standout companions recorded yet for California Bluebell.
Where to buy california bluebell seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing california bluebell" 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 California Bluebell in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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