How to Start a Lasagna Garden
While making lasagna requires a fair amount of prep and clean up, lasagna gardening is just the opposite. There is no prep work required, other than clearing the soon-to-be garden plot of rocks and debris. You don’t need to worry about tilling or turning the soil. (You are welcome to turn the soil with a spade to speed the composting process up by a couple of months but it is not necessary.) When choosing the location for your lasagna garden, consider the amount of sunlight that reaches the plot and what you would like to grow in the bed. Vegetables and herbs grow best in 8 hours of direct sunlight a day. Flowering plants also thrive in bright sunlight, at least 6 hours a day.
When to Make a Lasagna Garden
Fall is the best time to start your lasagna garden because you can harness freeze and thaw cycles over the winter to help break down the layers. Plus, rain or snow over the colder months will help keep the layers moist, which encourages them to break down faster. However, you can begin sheet composting anytime you have the materials on hand.
Add Layers of Organic Materials
Lasagna gardens are all about the layers. Newspaper or cardboard makes up the base to cover existing grass and deter weeds (4 to 6 sheets of newspaper or a single layer of cardboard). The newspaper or cardboard will prevent light from reaching the vegetation underneath, stopping its growth. Soak the paper layer thoroughly to jump-start decomposition and help it stay in place. Just like quality ingredients impact the finished flavor of your favorite dish, the best compost materials create the most nutrient-rich garden soil. Top the paper or cardboard base with a 2-inch layer of carbon-rich “brown” material such as chopped leaves, straw, sawdust, wood ash, wood chips, and pine needles. The smaller or more finely chopped the material is, the more quickly it will decompose. Add a 2-inch “green” layer on top of the brown. Components of this layer might be grass clippings, kitchen scraps from fruits and vegetables, well-rotted horse or cow manure, coffee grounds, and garden trimmings. It’s not so much the color that matters, it’s the fact that the material has moisture in it, rather than being dry and crispy like brown material. Continue stacking 2-inch green layers on top of 2-inch brown layers until your new bed is anywhere from 18 inches to 3 feet tall. As the materials decompose, they’ll shrink down quite a bit. For a finished edge, ring your lasagna garden with stones or bricks. If you want to create a raised bed in the space, add sturdy boards around your layers.
How Long Does Lasagna Gardening Take?
The microbes and earthworms working through the lasagna layers can take up to a year to transform the organic debris into nutrient-rich soil. Exact timing depends on several factors, including the size of the composted debris, temperature, and moisture. But the good news is all you have to do is sit back and wait. A lasagna garden is ready to plant when the composted materials are no longer recognizable. The leaves, grass clippings, and components will all look like loose black-brown soil, ready for your trowel. Now you can start planting veggies, herbs, and flowers to your heart’s content.
