I have learned that it is best to follow directions so I researched the Farmers Almanac and it says - December 2010, 13th-15th Plant Peppers, Sweet Corn, Tomatoes, And Other Above Ground Crops In Southern Florida, California, And Texas. Extra Good For Cucumbers, Peas, Cantaloupes, And Other Vine Crops. I happen to live in Texas so I planted mine. If you live in a mild-winter area like I do, you can plant seeds in fall through early winter and plant sets anytime in winter. If you live in a cold-weather area, you can start seeds indoors in winter and plant them out as soon as the soil is workable.
Onions like most veggies, like loose, rich, well drained soil. I plant mine in raised beds with layered mulch, soil, compost and straw. They like to be placed about 4-5 inches apart in a sunny location. Since onions are fairly shallow rooted you don’t need to water too deeply, but make sure they get watered frequently. Onions also like to be well feed, so if you aren’t planting them in a spot where you’ve planted green manure, you want to make sure you feed them regularly with an organic fertilizer or mulch them with grass. The bigger and stronger the plants, the bigger the bulbs.
You’ll know when it is time to harvest your onions when the tops have yellowed and have started to fall over. At that point, pull out your onions and leave them on the ground to dry for several days in the sun. Once the tops have dried completely, pull them off the onion bulb, brush of the dirt and store them in a dark, cool, well ventilated area.