Torenia (Wishbone Flower) in Zone 4a & 4b
Torenia fournieri
When to plant torenia (wishbone flower) in zone 4b
Zones 4a and 4b share the same average frost dates in our data, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. Torenia (Wishbone Flower) needs a head start most zones can't give it by direct-sowing alone.
| Start indoors | Mar 6–Mar 13 |
|---|---|
| Direct sow / transplant outside | May 29–Jun 5 |
| Estimated bloom | Aug 17–Aug 24 (~80 days after transplanting) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 0.5-1.5 ft.
Torenia earns its square by doing something most annuals cannot: flowering in shade, in July, without stopping.
How torenia (wishbone flower) fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Torenia (Wishbone Flower) needs about 80 days from transplant to first harvest.
Good companions
No standout companions recorded yet for Torenia (Wishbone Flower).
Where to buy torenia seeds
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See it growing
Search YouTube for "growing torenia (wishbone flower)" 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 Torenia (Wishbone Flower) in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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