Mulberry in Zone 4a & 4b
Morus rubra
When to plant mulberry in zone 4b
Zones 4a and 4b share the same average frost dates in our data, so this page covers both.
Method: Buy as a start: Buy as a nursery start and transplant outside. Mulberry is slow or unreliable from seed, so most gardeners skip seed-starting it entirely.
| Start indoors | Not started from seed; buy as a nursery start |
|---|---|
| Direct sow / transplant outside | May 15–May 22 |
| Estimated harvest | May 14 '30–May 21 '30 (First real harvest in year 4) |
Spacing: about 50 square feet per plant (square-foot-gardening spacing). Mature height: 10-20 ft.
Mulberry is a large, fast-growing native shade tree that also happens to produce sweet, blackberry-like fruit, prized by birds and other wildlife as much as by the people who plant it.
How mulberry fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Mulberry takes about 3 growing seasons to reach first worthwhile harvest, so what matters here is how many of these seasons it gets, not whether one is long enough.
Mulberry is hardy in zones 4-9, so in zone 4b it stays in the ground through winter and comes back rather than being replanted. Allow about 8 ft of spread at maturity.
Good companions
No standout companions recorded yet for Mulberry.
Where to buy mulberry starts
Mulberry is almost always bought as a nursery start rather than seeded. Check a local nursery or garden center; we haven't vetted online start/plant suppliers yet.
See it growing
Search YouTube for "growing mulberry" 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 Mulberry in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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