Mallow (High Mallow) in Zone 5a & 5b
Malva sylvestris
When to plant mallow (high mallow) in zone 5b
Zones 5a and 5b 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 10–May 17 |
| Estimated bloom | Aug 28–Sep 4 (~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 5's season
Zone 5b's frost-free window runs about 148 days, from May 10 to October 5. 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 5b 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 5b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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