You can use old sheets as landscape fabric for a short-term fix. But they will break down within a single growing season. Cotton bed sheets block light and slow weeds for a few months. That makes them a free option when you need quick coverage while your new plants get going.
I tested this with a set of old queen-size cotton sheets in a flower bed last spring. They held up great for the first two months. Not a single weed came through, and water soaked right past the cotton. By month three, the fabric got soft and pulled apart where it sat against wet soil. By month four, sections had turned to mush. I couldn't pull the bits out because decomposed cotton had mixed into your topsoil and mulch. It was a mess to clean up.
Cotton breaks down so fast because soil life treats it as food. Bacteria and fungi in wet ground eat through cotton fibers in weeks. Warm, damp conditions speed this up even more. A cotton sheets weed barrier gives you a few months at best. Real landscape fabric is made from polypropylene. Microbes can't digest that synthetic material. That is why store-bought fabric lasts years while your old sheets last months.
Your old sheets also lack the features built into real fabric. They have zero UV resistance, so any spot you leave exposed to sun falls apart fast. They have no set pore size for water. Some spots drain well while others trap moisture against your plant stems and cause rot. You can't pin sheets down with landscape staples either. The pins rip right through thin cotton and your sheets shift under mulch within weeks.
People try all kinds of household items as DIY landscape fabric. Old towels hold too much water against your soil. Carpet scraps contain dyes and glue that can leach into your garden. If you want a free option from around your house, plain newspaper works better than all of these. It lays flat, breaks down clean, and blocks light across the whole surface.
If you still want to use your old sheets, here is how to get the best results from them. Layer 2 to 3 sheets thick over your prepared bed. Overlap edges by at least 6 inches so weeds can't find gaps. Cover them right away with 3 inches (7.6 centimeters) of mulch to hold them flat and block UV damage. Know that this is a one-season fix. Your sheets will vanish into the soil by next spring.
That breakdown is fine since the cotton adds organic matter to your ground as it goes. For a free weed barrier that lasts about the same time, plain cardboard does a better job. It lies flatter, holds its shape longer, and blocks light more evenly than bunched-up sheets do. Either way, you're getting a single season of weed control at zero cost to you.
Read the full article: Landscape Fabric: Pros, Cons, and Uses
