Lobelia in Zone 7a & 7b
Lobelia erinus
When to plant lobelia in zone 7b
Zones 7a and 7b 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 6–Feb 13 |
|---|---|
| Direct sow / transplant outside | Apr 17–Apr 24 |
| Estimated bloom | Jul 6–Jul 13 (~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 7's season
Zone 7b's frost-free window runs about 198 days, from April 10 to October 25. 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 7b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Lobelia in USDA zone 7b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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