Mallow (High Mallow) in Zone 4a & 4b
Malva sylvestris
When to plant mallow (high mallow) 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. Mallow (High Mallow) 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 | Sep 2–Sep 9 (~110 days after direct-sowing) |
Spacing: about 4 square feet per plant (square-foot-gardening spacing). Mature height: 2-3 ft.
High mallow is a biennial, which puts it in a small group here: it occupies its square for two seasons and flowers in the second one.
How mallow (high mallow) fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Mallow (High Mallow) needs about 110 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Mallow (High Mallow).
Where to buy mallow seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing mallow (high mallow)" 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 Mallow (High Mallow) in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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