Troubleshooting
Joan J Raspberry problems — and how to fix them
Joan J Raspberry (Rubus idaeus 'Joan J') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Cutting canes at the wrong time
As a primocane (autumn) type it fruits on this year's growth. Cut every cane to the ground in late winter; pruning like a summer raspberry destroys the crop.
Grey mould (botrytis)
Late-autumn damp rots ripening berries. Pick frequently and keep the row open for airflow.
Drought during fruiting
Long autumn cropping is sensitive to dry soil, which shrinks and dries berries. Water consistently and mulch, especially in pots.
Spreading suckers
Vigorous suckers stray beyond the row. Pull or hoe off unwanted suckers, or contain with a root barrier or container.
Prevent joan j raspberry problems before they start
Most joan j raspberry issues are care-mismatch, not bad luck. Dial in the basics:
Looking for joan j raspberry in general rather than its problems? Read the full joan j raspberry care guide — light, water, soil and feeding.
Joan J Raspberry problems — FAQ
Why is my joan j raspberry cutting canes at the wrong time?
As a primocane (autumn) type it fruits on this year's growth. Cut every cane to the ground in late winter; pruning like a summer raspberry destroys the crop.
Why is my joan j raspberry grey mould (botrytis)?
Late-autumn damp rots ripening berries. Pick frequently and keep the row open for airflow.
Why is my joan j raspberry drought during fruiting?
Long autumn cropping is sensitive to dry soil, which shrinks and dries berries. Water consistently and mulch, especially in pots.
Why is my joan j raspberry spreading suckers?
Vigorous suckers stray beyond the row. Pull or hoe off unwanted suckers, or contain with a root barrier or container.