No Room for Alliums?
by National Gardening Association Editors
Onions can be planted in flower beds, window boxes, pots, borders - just about anywhere, even right in your potted flowers in the house. Simply push in a few sets or sprinkle on some seeds, and they'll grow very well right there on the windowsill.
Small Places for Onions
If you want a steady supply of small onions or scallions from a small space, use a 10-inch flower pot, and stick sets in very closely together. You'll be able to fit approximately a dozen in the pot, and they'll have enough room to grow. As soon as you harvest one, replace it. Be sure to provide your potted scallions with a good, steady supply of fertilizer, water and sunshine.
A few dozen onion sets planted in window boxes will hardly be noticeable. And you will have a good supply for salads, soups, and garnishes.
Because onions have very little foliage, they don't take up much room or hinder the growth of something else in the garden or flower bed. You can simply stick sets in here and there, and they'll enhance the flowers and give you a steady supply of onions.
Onions are usually ready to eat when the tops are six to eight inches tall. There will be something to eat top and bottom.
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