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If you are always looking for a way to produce an earlier crop of onions then consider planting autumn onion sets to steal a march on the competition. You can choose the original Japanese autumn onion sets or there are a number of new British bred varieties. Onion 'Shakespeare' is a particularly good cultivar which forms good sized bulbs, has superb overwintering and storage.
Before planting, prepare the ground several weeks earlier by digging in plenty of well-rotted garden compost to improve drainage and soil fertility. Avoid the temptation of using farm manure as this contains far more nitrogen than your onions require and will result in a poorer crop. If you are growing on particularly wet ground, then try growing onion sets on ridge or better still in raised beds. If your onions become waterlogged they can become prone to fungal root infections.
Onion sets are best planted in rows in a firm, well drained soil. When planting, make sure that the tip of the bulb is just showing through the soil surface.
Onions sets need very little once in place and will require watering only during periods of particularly dry weather. It will be important to keep the weeds down around your onion crop as these will over compete for soil nutrients and can result in a stunted crop. Use a hoe to control weeds in between the rows but hand weed between onions to prevent damage to the bulbs from hand tools.
Remove any flower spikes as soon as they appear to prevent onions from bolting as this will severely reduce the quality of the onion bulb
Autumn planted onions should be ready for harvest from late June or early July, a week or two after the leaves begin to turn yellow. This is usually a month or so earlier than spring planted onion sets.
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