Deter cabbage root fly, repel slugs & snails, control weeds around the plant and conserve moisture. Cabbage Collars are discs of black fabric coated with copper, 12.5 cm (5″) in diameter. The collar is cut to the centre, giving a tight fit around the plant but allowing the stem to grow without restriction. Pack of 18
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Seems to do the trick but 3 Broccoli plants have just died away while 3 others seem fine so far....open mind at moment.