This is the time of year that onions grow and develop rapidly. Regular
watering (if needed) and a light fertilization are helpful to maximize
growth. Onions develop so that as much as 2/3 of the bulb remains out of the
soil. This is normal and there is no need to cover the bulb with soil.
A gardener can tell when onions are nearing harvest time by some of the tops
falling over. You may wish to break over the tops that haven’t fallen to
encourage drying of the neck. Allow a few days to pass and then dig the
onions to insure they don’t sunburn. Temporarily store them in a dry,
well-ventilated area for a week or two before cutting the tops to insure the
necks are completely dry. Remove the foliage (or braid the
leaves) and store in a cool, dry location.
By: Ward Upham