| Key takeaways |
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| • Winterizing a raised garden bed protects soil health, blocks cold-weather weeds, and sets up an easier, more productive spring. • The core moves are simple: clear out spent plants, replenish and cover the soil, and protect the frame. • A cover crop, a fall soil test, and row covers add extra payoff if you want to go further. |
Winterizing your raised garden bed keeps the soil healthy, blocks cold-weather weeds, and gives you a head start next spring. The work is simple: clean out spent plants, replenish and cover the soil, and protect the frame before freezing weather sets in.
From covering the bed with shredded leaves to sowing a winter cover crop, you have several easy options to draw from. Here is how to winterize your raised garden bed, step by step, so it is ready when the growing season returns.
Short on time? Lawn Love’s flower bed weeding service keeps your beds clear of cold-weather weeds while you tackle the rest.
How to winterize your raised garden bed
To winterize a raised garden bed, clear out spent plants, replenish and cover the soil, protect any overwintering crops, and check the frame before hard freezes arrive. Work through the steps below in order for the best results.
Remove spent plants and clean up
After a killing frost or freeze, clean up any remaining or dead plants from the raised garden bed. Put healthy debris in the compost pile and throw diseased plants in the trash.
Carl Rosen, professor and extension soil scientist at the University of Minnesota, said removing diseased material is the one step people shouldn’t skip.
“Remove any diseased debris so diseased organisms do not build up in the soil,” Rosen says.
Pull any lingering weeds so they cannot seed next year. Remove, clean, and store tomato cages and other plant supports. Drain and put away hoses before a hard freeze, then smooth out the bed’s soil.
Replenish the soil
Raised bed soil loses organic matter over the growing season as plants use it up. Add layers of compost, planter’s mix, or other organic matter to bring the soil level to a few inches below the raised garden bed’s frame.
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Cover the soil
Bare soil in cold weather is an open invitation to weeds and other undesirable plants. You have lots of ways to cover it.
Jo Ellen Meyers Sharp, an award-winning garden writer known as The Hoosier Gardener in Indianapolis, Indiana, recommends using free fall leaves as cover.
“Lay them on top of your vegetable bed in the winter,” she says.
Shredded leaves: A 2- to 3-inch layer works well, especially for the DIY gardener. Collect them with a mulching mower’s catcher and spread them on the bed. They decompose over winter, feeding soil microbes and improving drainage. Work them into the top few inches of soil come spring.
Whole leaves: Unshredded leaves also work as mulch, but you may need to remove intact ones in spring. If they have started to decompose, dig them into the top few inches of soil instead.
Shredded bark or pine fines: Spread about 2 inches of finely shredded bark or pine fines. These break down fairly quickly, adding nutrients and improving soil structure.
Landscape fabric: If none of these options works for you, cover the raised garden bed with landscape fabric. It lets light and rain through while keeping weeds out. Remove it in spring.
Rosen says any of those options work, it just depends if it will be left on in the spring or removed.
“Shredded leaves will decompose faster than whole leaves in the spring. Bark fines will be slower to decompose but will be less prone to blowing with wind. Fabric, of course, will not decompose and will either need to be removed or left in place with holes to plant the transplants or seeds the following season,” he says.
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Plant a winter cover crop
A winter cover crop protects bare soil, curbs soil erosion, and, with legumes, adds nitrogen for spring. Also called green manure or living mulch, it fills the bed with living roots through the cold months.
Sow winter rye, clover, peas, or other legumes thickly about a month before your first hard frost, then water every day for 3 to 5 days. In early spring, cut or weed-whack the plants before they flower, let them dry, then dig them into the top few inches of soil.
If a cover crop is allowed to flower and set seed, it can become a weed in the summer garden, so always cut it down first.
| Cover crop | Main benefit | Good to know |
| Winter rye | Erosion control, cold hardy | Germinates in cold soil; cut it down before it gets tall in spring |
| Clover, peas, or vetch | Adds nitrogen | Legumes fix nitrogen for the next crop |
| Oats | Fast, easy cover | Winter-kills in cold climates for simple spring cleanup |
Test the garden’s soil
Fall is a good time to test the soil in your raised garden bed. A test reveals the nutrients and minerals present and recommends how to improve them, so you can add amendments in fall or spring.
At-home soil tests are handy but not always detailed. For the most thorough results, contact your local cooperative extension office for instructions on preparing a sample for soil testing.
Inspect the bed’s frame and drainage
Check that the soil under the frame has not eroded; if it has, add more soil to shore it up. Make sure the corners are still square and solid, and replace any rotted wood to prevent collapse and pest invasions.
Watch drainage, too. If water pools on the surface for more than a day, loosen the soil or work in more organic matter. During freeze-thaw cycles, gently tamp down soil that heaves up around plant roots.
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Extend the season and protect overwintering plants
Winter is a great time to think about extending your garden’s season. Row covers let you plant earlier in spring and keep crops going later into fall. Tent the cover over the bed to shield plants from frost.
Row covers add real frost protection: lightweight fabric holds about 2 degrees, while heavier covers can hold up to 8 degrees. They also shelter hardy crops like spinach, carrots, and kale, which can overwinter with protection in many regions, though how well depends on your climate zone.
Installation tip: Pound 8-inch-long PVC pipes into the outer edges of the bed until 1 inch stays above the soil level. Slide a slightly smaller PVC pipe to arch over the bed, 12 inches or higher, then secure the row cover over the arch.
FAQs
It is fine to leave perennials in the bed. If you have garlic planted, you can leave that, too. Just work the mulch around the plants so their crowns stay protected through the cold months.
Many cold-hardy vegetables, including spinach and carrots, can stay in the garden well into winter. Cover these plants with a foot or two of straw to insulate them. Move the straw aside to harvest, then tuck it back into place.
Plastic can warm the soil and shed heavy rain, but it also traps moisture and blocks air. For overwintering beds, breathable options like mulch, burlap, or a row cover usually protect the soil and plants better.
No. Leave the soil in place and improve it instead. Amend it with compost and cover it with mulch or a cover crop so it stays healthy, holds its structure, and is ready for spring planting.
When to call a gardening pro
If winterizing or tending your raised garden bed seems overwhelming, consider hiring one of Lawn Love’s local gardening pros. A Lawn Love pro can handle many of your gardening needs, from building new beds to planting trees and shrubs.
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Main Image Credit: Local Food Initiative | Flickr | CC BY 2.0
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