Spring Onion - Guardsman This is British-bred, vigorous variety producing salad onions with strong upright leaves and a supreme, non-pungent flavour. It is slow to bulb, perfect for summer crops in the vegetable garden or in pots of compost on the patio. Sow outdoors thinly, from March to September, where they are to crop, 1.5cm deep, directly into finely-prepared, well-dug, fertile soil, which has already been watered. Allow 15cm between rows. Seedlings usually appear in 14-21 days. No thinning is required, but keep well-watered in dry spells. Regular sowings, made every three weeks, will ensure a continuous supply through the summer. Harvest from March to October. August to September sowings will be ready the following spring.