What you need to know.
Raspberries are harder than they look in North Carolina. Our summers get hot and humid fast, and most raspberry varieties struggle — canes look heat-stressed by July and stop producing. But Heritage raspberries are different. Heritage is a fall-bearing type that is more heat-tolerant than most, and its main crop comes in September and October when temperatures finally cool back down.
I planted Heritage bare-root canes in February last year. By that September I had my first real harvest — a colander full every other day for about three weeks. The trick in Zone 7b is choosing fall-bearing over summer-bearing varieties, giving plants some afternoon shade, and not panicking in July when everything looks rough. They recover when the heat breaks.
"My canes looked nearly dead in July. Brown tips, wilting. By September I was picking a full colander every other day. They came all the way back."
Step by step.
Plant bare-root canes in late January or February while they are dormant. Most mail-order nurseries sell them in bundles of five or ten. Lay roots out in a shallow trench 6 to 8 inches deep, cover, firm the soil, and water. Space plants 18 to 24 inches apart in rows 5 feet apart.
Cut planted canes back to 6 inches — this looks brutal but forces strong new growth from the roots. After your first harvest in fall, cut all the canes that fruited down to the ground. Leave the new green canes that grew this year — those will produce next fall.
Water at soil level only, never overhead. Wet leaves in NC humidity lead to botrytis gray mold on fruit. A soaker hose along the row works well. Mulch heavily around the base to keep moisture consistent and reduce disease pressure.
When to plant in Zone 7b.
Plant in late January or February in Zone 7b. Fall-bearing Heritage canes produce their crop in September and October in our area — when nights cool into the 50s, the berries start ripening fast.
Summer-bearing types give a smaller bonus crop in late May or June from second-year canes before heat shuts them down. Fall is the reliable main event for raspberries in NC. I do not even try to grow summer-bearing types as a primary crop anymore.
Problems I ran into.
Japanese beetles are a serious problem in June and July — shiny copper-and-green beetles that skeletonize leaves and damage canes. I remove them by hand in early morning when they are sluggish, dropping them into a jar of soapy water. Do not use Japanese beetle bag traps — they attract more beetles from the surrounding area than you started with.
Botrytis gray mold turns ripe berries soft and fuzzy-gray fast in humid weather. Pick every day during wet stretches. Leave nothing ripe on the cane. Thinning canes to 6 per foot of row improves air circulation and makes a real difference.
What I make with it.
Raspberries are intensely flavored — a little goes a long way. I freeze most of my crop flat on a baking sheet and bag them. Frozen raspberries make incredible sorbet with just three ingredients: berries, sugar, and lemon juice.
The full raspberry sorbet recipe is on the recipes page. My dad says it is better than the store kind. I agree.