If you planted garlic last fall, it now needs mulching with compost. I use compost made from either crab or lobster waste. Both have a good supply of calcium and a medium to high level of slow-release nitrogen for when soil temperatures rise above freezing. Mulching also protects these shallow-rooted plants from rapid temperature changes.
If you plan to grow onions this spring, consider growing your own seedlings. Last year, instead of purchasing seedlings from Texas, I grew all my onions from seed and had the biggest and best crop ever. Since onion seeds are slow to germinate, seeds should be sown in prepared potting blends before the end of January. I highly recommend Copra and Candy. Both are good keepers, and Candy is as mild tasting as any Vidalia onion.
Sow the onion seeds approximately a quarter- to a half-inch apart on the surface of the soil. Cover lightly by placing potting mix on a piece of window screen and shaking it over the seeds. Water well. Locate the containers where the soil will remain about 80 degrees. Onion seeds will germinate in about two weeks at this temperature.
Once most of the seeds have germinated, place the container in full sun at a window facing south, as onion plants will grow in cooler temperatures. As daylight hours get longer, you will observe increased growth. Once the seedlings reach three inches tall, start making light applications of liquid fertilizer at three-week intervals.
By mid March to early April, the onion plants will be five to six inches tall and ready to transplant into the garden. Onion plants are very cold-tolerant and can be planted early. They do best in soils rich in compost. I incorporate an inch or two of compost into the soil just prior to planting.
If you prefer large onions, space the seedlings at least six inches apart. For smaller onions, space them four inches apart. I grow mine in solid blocks with spacing either six by six or four by six inches. I like the six-inch spacing between rows so that I can cultivate with my onion hoe. After the soil has been prepared, use a dibble to make the planting holes. Then, using your fingers, lift the onion seedlings in clusters from their rooting medium. Separate the seedlings, putting one in each hole. After all of the seedlings have been planted, use a stream of water to wash the soil into the planting holes to cover the roots.
Once the onions start to bulb in June, stop cultivating the soil between the rows. The slightest amount of mechanical damage to the skin of the bulb will induce rot.
As soon as the tails of the onions show yellow and browning, use a rake and knock down the tails to prevent neck rot microorganisms from entering the stem. Neck rot will spoil your onions when you put them into storage as summer ends.
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