Why Is My Harvested Cabbage Rotting in Storage?

Harvested cabbage that begins to rot within days or a week of storage — developing soft, slimy patches, bad smells, or a grey-white mould — has been infected with either bacterial soft rot (Pectobacterium carotovorum, which produces the characteristic foul smell and slimy collapse of tissue) or grey mould (Botrytis cinerea, producing grey furry mould on the surface). Both enter through physical damage to the head — cuts, bruising, caterpillar holes, or naturally split or cracked areas — and spread rapidly under warm, moist storage conditions.

Harvest technique affects storage life

A clean cut through the stalk with a sharp knife produces a smooth surface that deteriorates more slowly than a torn or ragged cut. Do not cut into the head itself — cuts through the head create entry points for rot. Leave several of the outermost wrapper leaves intact when harvesting — these outer leaves slow moisture loss and protect the head. Bruising the head during harvest or transport creates soft spots that rot faster. Handle heads carefully.

Storage conditions

Cabbage stores best at 0–2°C with high humidity (90–95% relative humidity). In practice, this means the refrigerator vegetable drawer for most home growers. At refrigerator temperatures, a whole, undamaged cabbage with its outer leaves intact should store for four to eight weeks. At room temperature (18–22°C), even undamaged heads deteriorate in one to two weeks. Avoid storing cabbage near apples or pears — these produce ethylene that accelerates cabbage aging.

Selecting which heads to store

Only store undamaged, pest-free heads — any head with caterpillar holes, splits, or soft spots will rot first and may spread infection to adjacent stored heads. Use damaged heads immediately. Do not store heads harvested from bolted or diseased plants. Autumn and winter cabbages (savoy types in particular) store significantly better than summer varieties, which are more prone to deterioration.