Lobelia in Zone 6a & 6b
Lobelia erinus
When to plant lobelia in zone 6b
Zones 6a and 6b share the same average frost dates in our data, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. Lobelia needs a head start most zones can't give it by direct-sowing alone.
| Start indoors | Feb 21–Feb 28 |
|---|---|
| Direct sow / transplant outside | May 2–May 9 |
| Estimated bloom | Jul 21–Jul 28 (~80 days after transplanting) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 4-8 in.
Lobelia is the smallest flower in this dataset and one of the earliest to start indoors, which catches people out.
How lobelia fits zone 6's season
Zone 6b's frost-free window runs about 173 days, from April 25 to October 15. Lobelia needs about 80 days from transplant to first harvest.
Good companions
No standout companions recorded yet for Lobelia.
Where to buy lobelia seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing lobelia" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 6b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Lobelia in USDA zone 6b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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