Plant your onions 4 to 6 weeks before the last estimated spring freeze. If your soil is too acidic, mix in ground limestone, available at your garden center. Visit to locate the nearest extension service. Your agricultural extension service can test your soil for you, or you can buy a home test kit at your local garden center. Onions prefer soil with a pH between 6.2 and 6.8. It’s helpful to know whether your soil is acid (pH below 7.0) or alkaline (pH above 7.0). ![]() Don’t worry, this type of herbicide will not affect the onion plant roots. To stop weeds for up to six weeks, rake a pre-emergent herbicide, such as Treflan or corn gluten meal, into the top inch of soil before you plant. If it's compacted, work in compost to improve aeration and drainage. Onions grow best on raised beds or raised rows at least 4" high and 20" wide. Choose a location that gets plenty of direct sun. Onions require full sun and good soil drainage.
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