Use your hands or shoes to firmly tamp the soil over the top of the onions; they grow better in firm, rather than loose, soil. The technique i use this time is to not push them too deep into the ground, as i believe the hard soil i have hinders their growth. secondly, i am also using growmore fertilizer this year, quite smelly stuff but i only used a sprinkle of it over each row possibly every month or 2. Onions are a common garden plant that will grow in most soil types. The soil should be firm. » Proper fertilization before planting and during the season with complete fertilizers containing all the needed major and minor ele-ments. Growing Onions – Preparing The Soil And Planting Plant onions in furrows with the tips pointing up. If your soil is heavy then you can introduce some organic compost or manure into the soil to help its moisture retaining properties. An inch of water will wet a sandy soil to a depth of 10 inches, a heavy clay soil to 6 inches. The soil needs to be extremely well-drained—even sandy—but also needs to have a good deal of well-decomposed organic material in it. However, if your soil is approaching a 100 percent sand content, you’ll want to amend it with compost and other organic materials to give it the nutrients and texture vegetables need. Like most vegetables, onions grow best in rich, fertile and loose soil. I haven't had a good growing success with red barons but i have started to grow white onions this year. The amount of fertilizers needed varies by location, soil fer- Onions grow better on light sandy loam soils. You can increase your gardening success with onions by working manure into the soil each year as part of a maintenance plan. If the planting does not receive one inch of rain each week, soak the soil thoroughly at least once a week. Finish up planting by adding a bit of water, and you're set to watch them grow! Transplanted onions require more water than sets or seeds, so give yours a little extra moisture if that's what you planted. Onions are shallow-rooted and require constant moisture for good growth. If you have heavy soil, consider amending with organic compost to help your soil retain more moisture. Proper soil is the key element to growing onions successfully. Onions will grow in almost any soil from sandy loams to heavy clay. Onions will grow in almost any soil from sandy loams to heavy clay. Onions don’t even need soil to grow. Growing onions in water. » Well prepared, deep, smooth and fertile soil beds. If your soil is heavy then you can introduce some organic compost or manure into the soil to help its moisture-retaining properties. Onions prefer a slightly acidic soil – PH 5.5-6.5 is a good PH for growing onions… Onions prefer soil that has a pH from 5.5 to 6.5. Onions prefer a slightly acidic soil - PH 5.5-6.5 is a good PH for growing onions… The soil should be firm. 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