By Emily Murphy
When creating a space for a new flower bed or veggie garden, it’s important to first prepare the soil. This is especially true if you’re working with compacted or clay soil. Tilling and adding compost give you a head start to a better growing season.
It’s best to till a new garden in the spring when soil is dry and weather is becoming warm. For some, this may be as early as March, while others may have to wait until May or early June depending on the region and climate. Tilling wet soil damages the valuable, existing structure which you’ll need as your garden grows. Insert a trowel into the soil to determine when it is dry. If it’s difficult to insert and the soil feels dry to the touch, it’s ready.
To sheet mulch, first determine where your new garden will grow, remove any large weeds or shrubby plants, and wet soil using Gilmour’s Heavy Duty Front Control Watering Nozzle and Flexogen Super Duty Hose.
The cardboard is a natural weed barrier and a source of carbon.
Then add a 1- to 2-inch layer of mulch over the compost, using leaves, bark, or another organic mulch.
This is much easier to do after a season of sheet mulching. To double-dig, dig a 12-inch-wide trench with a spade that reaches to the depth of the spade (about 8 inches). Dig the trench from one end of your new garden to the other end, placing the soil from the trench on a nearby tarp or in a wheelbarrow.
Once loosened, but not turned, sprinkle a 2-inch layer of compost into the trench and gently work it into the soil.
Again, dig this trench so it runs the full length of the new garden. As you dig, place the soil from this second trench into the opening of the first trench. It’s best to avoid mixing the soil when moving it from one trench to the other, so let it slide off your spade rather than turning it. This will help maintain beneficial soil structure.
Before planting, spread a final 2-inch layer of compost over the entire bed.
When you sheet mulch in fall and double-dig in spring, it prepares a planting area that is ready to grow a fabulous garden while working with nature. Soil is habitat for microbes and animals like worms that do much of the work of maintaining healthy soil. When we double-dig instead of using a machine like a rototiller, we till in such a way that is least destructive to soil health while adding aeration and organic matter.
Double-digging adds aeration and organic matter to soil as deep as 18 inches. This is twice as deep as a typical rototiller, giving plants and their root systems the very best start.
Remember to first prepare garden soil with sheet mulching, this will make the work of double-digging in spring far easier. It also adds organic matter and helps manage weeds in advance. Sheet mulching is also a great method for converting lawn into a garden. Simply place your sheet mulching layers over the grass.
It’s best to not turn soil often. Most soils develop over years, forming layers that are home to a variety of animals needed to grow healthy gardens. When we move soil in the double-digging approach to tilling, we add aeration and organic matter while disturbing natural soil ecology as little as possible.
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