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GardenSMART :: Cold Weather Cover Crops

Cold Weather Cover Crops

By Heather Rhoades, GardeningKnowHow.com
Photographs courtesy of GardeningKnowHow.com

Cover crops are an often-overlooked way to improve the vegetable garden. Oftentimes, people consider the time between late fall to winter to early spring to be a time where the vegetable garden space is wasted. We think our gardens rest during this time, but this is not the case at all. During cold weather, there's something you can do to help improve your garden for next year: use cover crops.

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What is a Cover Crop?

A cover crop is anything that is planted in order to literally "cover" a piece of land that is not in use. Cover crops are used for a wide variety of reasons, from green manure to soil improvement to weed control. For the home gardener, the question of where to plant cover crops comes down to what part of your garden will be empty during the cold weather.

Cover crops are most often planted as green manure. Nitrogen fixing cover crops are much like sponges that soak up nitrogen as well as other nutrients that might otherwise be lost to weeds or washed away by rain and snow melt. Even non-nitrogen fixing plants will help to ensure that many of the nutrients in the soil can be returned to the soil when the plants are tilled under in the spring.

Cover crops are also a wonderful way to help maintain and even improve the condition of your soil. While planted, cover crops prevent erosion by holding the topsoil in place. They also help reduce soil compaction and help the beneficial organisms in the soil, like worms and bacteria, to flourish. When the cover crops are worked back into the soil, the organic material they provide increases how well the soil can hold onto water and nutrients.

Lastly, when you plant a cover crop, you are growing plants that can compete with weeds and other undesirable plants that would like to take up residence in your garden while it is empty. As many gardeners can speak to, often a vegetable garden left empty over the winter will be filled with cold hardy weeds come mid-spring. Cover crops help prevent this.

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Choosing a Cold Weather Cover Crop

There are many choices for cover crops and which is best for you will depend on where you live and your needs. Cover crops tend to fall into two categories: legumes or grasses.

Legumes are beneficial because they can fix nitrogen and tend to be cold hardy. But they can also be a little harder to establish and the soil must be inoculated for the legumes to be able to properly take up and store the nitrogen. Legume cover crops include:

  • Alfalfa
  • Austrian winter pea
  • Berseem clover
  • Black medic
  • Chickling vetch
  • Cowpea
  • Crimson clover
  • Field peas
  • Hairy vetch
  • Horse beans
  • Kura clover
  • Mung beans
  • Red clover
  • Soybeans
  • Subterranean clover
  • White clover
  • White sweet clover
  • Woolypod vetch
  • Yellow sweet clover

Grass cover crops are easier to grow and can also be used as wind blocks, which further help prevent erosion. But grasses tend not to be cold hardy and cannot fix nitrogen. Some grass cover crops include:

  • Annual ryegrass
  • Barley
  • Triticale
  • Wheatgrass
  • Winter rye
  • Winter wheat

Winter cover crops can help you improve and make use of your garden year round. By using cover crops, you can be sure that you will be getting the most out of your garden next year.

 


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