Preparing Soil - Knowledgebase Question

Milwaukee, WI
Avatar for lombardipack
Question by lombardipack
August 26, 2006
We are going to be planting a small vegtable garden next spring. The soil has been under a plastic weed barrier. Is there any thing we can do this fall to help get soil ready? I am concerned about any weeds may grow as soon as they get light and water next spring.

Answer from NGA
August 26, 2006
The answer really depends upon how long the weed barrier has been in place and whether or not it has holes in it for air exchange and water penetration. If it is black plastic sheeting, I'd remove it in the fall and spread a 5-6" layer of organic matter (such as compost, shredded leaves, etc.) over the entire bed with the plan to till or dig the material into the soil just prior to planting. A 5-6" layer will shade out any weed seeds that might be lurking on the soil surface. Black plastic should effectively kill weeds and weed seeds if it has been in place for 3-4 months of hot summer weather, but you never know... You'll want to remove it this fall so the soil can breathe and drink up moisture from fall rains. If it's covered with organic matter, it shouldn't sprout weeds, but you'll have much healthier soil in the spring.

If you have air and water permeable weed barrier, leave it in place until a few weeks before you're ready to plant in the spring. At that time remove the weed barrier and spread a 2-3" layer of organic material over the entire bed, rototilling or digging it in to a depth of about 8". Then plant your veggie garden.

Best wishes with your veggie garden!

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