Mashua in Zone 6a & 6b
Tropaeolum tuberosum
When to plant mashua in zone 6b
Zones 6a and 6b share the same average frost dates in our data, so this page covers both.
Method: Direct sow: Direct-sow outside. Mashua doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | Apr 25–May 2 |
| Estimated harvest | Nov 21–Nov 28 (~210 days after direct-sowing) |
Spacing: about 2 square feet per plant (square-foot-gardening spacing). Mature height: 2-8 ft.
Mashua is a vigorous climbing Andean tuber crop and, botanically, a relative of the ornamental nasturtium already in this dataset, though it's grown for its tubers rather than its flowers.
How mashua fits zone 6's season
Zone 6b's frost-free window runs about 173 days, from April 25 to October 15. Mashua needs about 210 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Mashua.
Where to buy mashua seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing mashua" 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 Mashua in USDA zone 6b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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