Blackberry in Zone 7a & 7b
Rubus fruticosus
When to plant blackberry in zone 7b
Zones 7a and 7b 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. Blackberry 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 | Mar 13–Mar 20 |
| Estimated harvest | Mar 12 '29–Mar 19 '29 (First real harvest the season after planting) |
Spacing: about 7 square feet per plant (square-foot-gardening spacing). Mature height: 5-8 ft.
Blackberries have a reputation as something that grows in a hedge and tears your arms, and for wild ones that's fair. Thornless upright varieties changed the calculation: a plant you can pick with bare hands, that stands up without a trellis, and produces more fruit than most households can eat.
How blackberry fits zone 7's season
Zone 7b's frost-free window runs about 198 days, from April 10 to October 25. Blackberry takes about 1 growing season to reach first worthwhile harvest, so what matters here is how many of these seasons it gets, not whether one is long enough.
Blackberry is hardy in zones 5-9, so in zone 7b it stays in the ground through winter and comes back rather than being replanted. Allow about 3 ft of spread at maturity.
Good companions
No standout companions recorded yet for Blackberry.
Where to buy blackberry starts
Blackberry 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 blackberry" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 7b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Blackberry in USDA zone 7b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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