World Composting | Lasagna Composting Checklist

📖 Understand sheet mulching Sheet mulching (lasagna composting) smothers grass with cardboard, then builds alternating layers of carbon-rich browns and nitrogen-rich greens on top. Microbes, worms, and fungi break it all down into garden soil — no tilling required. 📍 Choose your site Pick a spot with at least 6–8 hours of sun for most vegetables. Good drainage matters — avoid low spots where water pools. You can build directly on grass, lawn, or bare soil. 📅 Decide timing — fall or spring Fall is ideal because layers break down over winter so beds are ready for spring planting. Spring builds work too — use more finished compost on top so you can plant sooner. Either way, the bed needs at least 4–6 weeks to begin settling. 📋 Gather materials list You'll need corrugated cardboard (remove tape & labels), finished compost, straw or dried leaves, nitrogen sources (grass clippings, manure, green trimmings), and a garden sprayer for soaking each layer. Lay it all out before you start. 📏 Mark bed boundaries Use string, stakes, or a hose to outline your bed. Standard sizes: 3–4 ft wide (so you can reach the center) and as long as you like. Make sure paths around the bed are wide enough for a wheelbarrow. 📦 Kill existing grass with cardboard Cardboard is the foundation. It smothers grass and weeds by blocking all sunlight while letting water and air pass through. Use plain corrugated cardboard (no glossy coating, no colored ink, remove all tape and staples). Overlap edges by 6 inches so grass can't sneak through.

📦 Lay cardboard over grass Cover the entire bed area with overlapping corrugated cardboard. Extend 6 inches past your bed boundaries. Wet the cardboard lightly so it stays in place. This is your weed barrier and the start of your lasagna. 💧 Soak cardboard thoroughly Use a garden hose or sprayer to soak the cardboard until it's fully saturated. Wet cardboard molds to the ground better and starts breaking down faster. It also signals to worms that food is on the way up. 🧫 Add first compost layer Spread 2–3 inches of finished compost directly on the wet cardboard. This introduces beneficial microbes right at the grass layer and gives decomposers a foothold. Use quality compost from a local nursery or your own pile. 🌾 Add straw or leaves Top the first compost layer with 4–6 inches of straw, dried leaves, or untreated grass clippings. This is your first carbon (brown) layer. Straw is ideal because it's fluffy and holds air — skip hay, which brings weed seeds. 🧪 Add second compost layer Add another 1–2 inches of compost on top of the straw to jumpstart decomposition and add nutrients. This inoculates the carbon layer with microbes and nitrogen, getting the whole pile cooking. 🪵 Build edges If you want a clean border, use untreated lumber, landscape timbers, or stone to edge the bed. Edging keeps layers from spilling into paths and helps retain moisture. A 6–12 inch tall frame is plenty — the bed settles to about half its height.

🟫🟩 Alternate green and brown layers Keep building with alternating layers: browns (straw, dried leaves, cardboard, wood chips) and greens (grass clippings, vegetable scraps, coffee grounds, fresh trimmings). A roughly 3:1 brown-to-green ratio by volume prevents the pile from getting slimy or too dry. 💩 Add manure layer Aged horse, cow, or chicken manure is a powerful nitrogen boost. Spread a 1–2 inch layer in the middle of the pile. Only use well-aged manure — fresh manure can burn roots and may harbor pathogens. If you're planting food crops, let it age at least 6 months. 🪨 Sprinkle rock dust or minerals A light dusting of basalt rock dust, azomite, or crushed oyster shells adds trace minerals that feed soil biology and slowly release over time. Think of it as a multivitamin for your soil — a few handfuls spread across the middle layers go a long way. 📏 Maintain 3–6 inch layer height Each individual layer should be 3–6 inches thick. Thinner layers mat together and restrict airflow; thicker layers take too long to break down. The total pile should reach 12–18 inches tall — it will settle to roughly half that within a season. 💧 Water each layer After every 2–3 layers, soak everything thoroughly with a hose or sprayer. Moisture is what drives decomposition — a dry lasagna bed won't break down. Each layer should feel like a wrung-out sponge before you add the next. 🥇 Add final thick compost layer Once you've built up your green/brown layers to 10–14 inches, cap everything with 3–4 inches of finished compost. This is your planting layer — the only layer you'll dig into. Make sure it's quality compost, screened and dark, smelling like earth.

🧤 Add 3–4 inches of finished compost on top The top compost layer is where roots will establish. Use the best finished compost you can find — dark, crumbly, earthy-smelling. This layer protects the bed, retains moisture, and gives transplants an immediate nutrient source. 🌾 Mulch with straw or leaves Spread a 2–4 inch layer of straw or shredded leaves on top of the finished compost. This acts as a protective blanket — it retains moisture, moderates soil temperature, stops weeds from germinating, and slowly feeds the bed as it breaks down. 💧 Water thoroughly Give the entire bed a deep, slow watering until water runs from the bottom. This settles all the layers together, eliminates air pockets, and activates the decomposition process. A good rule: the bed should feel heavy and moist, like a wet sponge. 🧺 Cover with landscape fabric for first month If you build in hot weather or need to suppress weeds while the bed establishes, cover with landscape fabric or a tarp for the first month. This traps heat and moisture, speeding decomposition. Remove it once you're ready to plant. 🌱 Plant immediately or wait You can plant into a fresh lasagna bed right away using the top compost layer — good for seedlings and transplants. For best results, wait 4–8 weeks to let layers settle and decomposition begin. Seeds like lettuce and beans do fine planted directly into the top 3 inches. ☃️ Protect for the season If building in fall, top with 4–6 inches of straw and let the bed overwinter. Winter frost and thaw cycles help break down layers naturally. Come spring, pull back the straw mulch and plant directly into the rich compost layer.

💧 Watering schedule first month For the first month, check moisture every 2–3 days. The bed should stay consistently damp but not soggy. Stick your finger 4 inches in — if it feels dry, water deeply. A garden sprayer makes it easy to water evenly without disturbing the mulch. 🧹 Add more mulch as layers settle The bed will shrink — sometimes by 50% or more — as layers decompose. Top up the straw mulch layer every few weeks to maintain 2–4 inches of cover. This keeps weeds down and moisture in. As the bed sinks, you can also add thin layers of finished compost. 🌿 When to plant transplants Wait until the bed has settled for 4–8 weeks before planting large transplants like tomatoes, peppers, or squash. Dig a small hole through the compost top layer into the partially decomposed material below. Roots will quickly colonize the loose, rich layers. 🌰 Direct seeding tips Small seeds (lettuce, carrots, radishes, beans) can be sown directly into the top 1–2 inches of compost. Rake the surface smooth, sow seeds, and cover lightly with compost or seed-starting mix. Keep the surface moist until germination — the compost layer holds moisture well. 🍽️ Feed the bed long-term Each season, top-dress with 1–2 inches of fresh compost. You can also water with compost tea or dilute worm casting tea for a microbial boost. The decomposing lower layers feed plants all season long — lasagna beds often get better with age as the soil food web establishes. 🔄 Next year refresh By year two, the original layers will have fully broken down into rich, dark soil. Refresh the bed by adding 2–3 inches of compost on top and a fresh layer of straw mulch. The cardboard will be gone, worms will be abundant, and you'll have the best soil on your property.