If you eat two onions a week, plant a little over 100 seedlings or sets. That amount will take up 50 row feet of garden space. If you eat an onion a day, consider planting 400 or so seedlings or sets (or some combination of the two). How many onions should you grow? How many do you eat in a year? In a well-tended plot, most of the onions you plant turn into good-sized bulbs. Their tops do not compete well with weeds, hence the importance of weeding-shallowly, to prevent injuring the shallow roots. Onions are shallow-rooted and respond well to an even supply of soil moisture. Keep the onion plot weeded and watered throughout the growing season. As with sets, then place four plants in each planting hole, and space each bunch of four onions about 6 inches apart. Then in late April or early May, transplant the seedlings to a fertile, well-drained spot in the garden. The seeds may take a couple of weeks to germinate don’t give up! Keep the containers warm (near, but not too near, the wood stove, for instance, or on top of the refrigerator) and keep the seed starting mix moist. One way to start onions from seed indoors is to sow the seed in two rows, about a quarter-inch deep, in 4- x 6-inch containers filled nearly to the top with a seed starting mix. There are also an abundance of onion types that you can start indoors and plant in your garden when the time is right. (‘Ailsa Craig’ and ‘Walla Walla’ tend to have a short storage life.) ‘Marsi’ is a beautiful, red hybrid that stores into April. ‘Copra,’ for example, is a favorite hybrid among some growers, and it stores well. Organic grower Jason Kafka of Checkerberry Farm in Parkman, Maine, once reported that his 3 1/2 ounces of ‘Ailsa Craig’ seed grew 8,000 pounds of onions on 0.4 acres. The advantage to using seeds is that you have a greater selection of varieties, such as the big, sweet ‘Ailsa Craig’ and ‘Walla Walla’ cultivars. You can also start onions from seeds sown indoors in February or early March. Here’s how to start onions from seed in late winter/early spring Types of Onions This method, advocated by Eliot Coleman, simplifies planting, watering, weeding and harvesting. In late April or early May, place the small bulbs about an inch deep in the garden, with four bulbs together, touching each other, and each bunch of four onion sets about 6 inches apart within rows. Sets are available from seed catalogs, garden centers and hardware stores. The easiest way is to plant “sets” (small onions) in the spring. Home gardeners can easily grow all the onions they’ll need for the year.
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