Mulberry in Zone 4a & 4b
Morus rubra
Yes, mulberry grows in zones 4a and 4b and comes back each year. Set out nursery plants May 15–May 22.
When to plant mulberry in zone 4b
Zones 4a and 4b share the same average frost dates, so this page covers both.
Method: Buy as a start: Buy as a nursery start and transplant outside. It's 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 | First real harvest in year 4 |
Spacing: about 50 square feet per plant (square-foot-gardening spacing). Mature height: 10-20 ft.
Before you plant: Mulberry has a winter-hardiness note for zone 4b. See the details below.
Plant alongside it in zone 4b
These go outside within two weeks of mulberry in zone 4b, so one planting day can cover them.
- AppleMay 1–May 8
- Aronia (Black Chokeberry)May 1–May 8
- ElderberryMay 1–May 8
- Goji BerryMay 1–May 8
- Honeyberry (Haskap)May 1–May 8
- LingonberryMay 1–May 8
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.
Mulberry planting windows in every zone
Zone 4b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 4a & 4b (your zone) | Buy as a start | May 15–May 22 | First real harvest in year 4 |
| 5a & 5b | Buy as a start | May 10–May 17 | First real harvest in year 4 |
| 6a & 6b | Buy as a start | Apr 25–May 2 | First real harvest in year 4 |
| 7a & 7b | Buy as a start | Apr 10–Apr 17 | First real harvest in year 4 |
| 8a & 8b | Buy as a start | Mar 25–Apr 1 | First real harvest in year 4 |
| 9a & 9b | Buy as a start | Feb 15–Feb 22 | First real harvest in year 4 |
Good companions
No well-established companions 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.
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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)
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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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