Troubleshooting
Calabrese Broccoli problems — and how to fix them
Calabrese Broccoli (Brassica oleracea var. italica 'Calabrese') 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.
Premature buttoning
Tiny, useless heads form early when seedlings are stressed by cold, drought, or root-bound transplant check. Grow plants on without checks, harden off carefully, and keep moisture and feeding steady.
Cabbage caterpillars
Cabbage white and moth caterpillars bore into the heads and hide among the buds. Net with fine mesh from planting, inspect leaf undersides, and remove caterpillars and eggs by hand.
Cabbage aphids
Grey aphid colonies hide deep in the head and leaf crowns, hard to wash out later. Check plants often, hose off colonies early, and encourage predatory insects.
Clubroot
Swollen, distorted roots stunt plants in acidic, wet soil. Lime to raise pH, improve drainage, rotate brassicas, and keep infected material out of the compost.
Prevent calabrese broccoli problems before they start
Most calabrese broccoli issues are care-mismatch, not bad luck. Dial in the basics:
Looking for calabrese broccoli in general rather than its problems? Read the full calabrese broccoli care guide — light, water, soil and feeding.
Calabrese Broccoli problems — FAQ
Why is my calabrese broccoli premature buttoning?
Tiny, useless heads form early when seedlings are stressed by cold, drought, or root-bound transplant check. Grow plants on without checks, harden off carefully, and keep moisture and feeding steady.
Why is my calabrese broccoli cabbage caterpillars?
Cabbage white and moth caterpillars bore into the heads and hide among the buds. Net with fine mesh from planting, inspect leaf undersides, and remove caterpillars and eggs by hand.
Why is my calabrese broccoli cabbage aphids?
Grey aphid colonies hide deep in the head and leaf crowns, hard to wash out later. Check plants often, hose off colonies early, and encourage predatory insects.
Why is my calabrese broccoli clubroot?
Swollen, distorted roots stunt plants in acidic, wet soil. Lime to raise pH, improve drainage, rotate brassicas, and keep infected material out of the compost.