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The Year’s Last Garden Chore

Control winter weeds now, as they’ll be bigger come spring

It takes more than frost or snow to kill chickweed — try a couple treatments of horticultural vinegar.

Winter annual weeds tend to sneak up on you.
    Have you looked at your garden lately? When you do, don’t be surprised if you see a green carpet being woven by winter annual weeds. Annual bluegrass, chickweed, cranesbill and henbit are pretty small now. But if you don’t get out there and control them, they will be much larger next spring.
    It takes more than hoeing to bring them under control. If you simply hoe them out of the ground and leave them lie, they will soon generate new roots and resume growth. After hoeing, rake them up and put them in your compost. Adding weeds provides compost with much-needed nitrogen. The weeds are also succulent and full of water, and the little bit of soil attached to their roots provides inoculum to help in degrading leaves. You need not worry about winter weeds contaminating your compost pile with seeds because these weeds are still in their juvenile form and have not started flowering, which they must before they can produce seeds.
    If you prefer not to disturb the soil by hoeing, use horticultural vinegar, to which these weeds are very sensitive. However, you have to spray the foliage thoroughly to obtain good results. Chickweed takes repeated applications because its foliage is very dense with many overlapping leaves. The first application of horticultural vinegar will only kill the exposed leaves. Make a second application after the first layer of leaves has disintegrated.
    Winter weeds will grow all winter long. They can even grow under snow cover. Trying to kill them with organic mulches is a waste of time. I have seen these weeds grow under the cover of mulch. It is surprising how little light they need to survive. However, covering them with black plastic or tarpaper is effective. Avoid black landscape fabric; it has sufficient pin holes to allow them to continue growing.
    Get a jump on spring gardening by controlling winter weeds now.


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