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I checked my cabbages two days ago and decided that they were ready for haresting but my wife said "leave it 'til tomorrow" so I did.
Yesterday morning I found that 4 of them had been attacked by either mice or even rats or something because the hearts were half eaten!! I had one left plus two others still maturing. Last year it was just slugs, snails and whitefly!!! stevmk2
I gave up on brassicas so didn't grow any this year, I got too tired of battling slugs, snails, birds, mice, caterpillars et al and, like you Martin, it was always seemed just as you were ready to harvest...infuriating..