For the best onions sow in January indoors with heat. Alternatively they can be sown from February under cover. They should be transplanted in April to their final growing position. Onions can also be direct-sown from March in drills 25cm apart, spacing seeds 1cm apart within the drill. They should then be thinned to 10cm spacing once established.
Onion growing calendar
Onions are likely to be native to Central Asia. It is presumed that wild onions have been consumed long before farming was invented and they have probably been cultivated for more than 5,000 years. Onions may be one of the earliest cultivated crops and became popular all over the world. Today the area under onion production worldwide is 3 millions hectare with a production of approximately 55 million tonnes.