Yard Composting and Natural Fertilization in Iowa

Iowa soil varies a lot from one property to the next. Some lots have decent topsoil with good organic matter. Others are mostly heavy clay that compacts into something resembling pottery when it dries out. The common thread is that almost every yard in the Cedar Valley can benefit from compost. It is the single best thing you can add to your soil, regardless of what kind of soil you have. Compost improves drainage in clay, adds water retention to sand, feeds the microorganisms that make soil healthy, and provides a slow, steady supply of nutrients to your plants. You cannot beat it.

Starting your own compost pile is simple and saves you money on soil amendments. You need a mix of green material and brown material. Greens are things like grass clippings, vegetable scraps, and coffee grounds, which provide nitrogen. Browns are things like dried leaves, straw, and shredded paper, which provide carbon. Aim for roughly equal parts by volume. Keep the pile as moist as a wrung-out sponge, and turn it every couple of weeks to add oxygen. A well-managed pile starts producing usable compost in 3 to 6 months depending on the season and how diligent you are about turning it.

If you do not want to manage a pile, you can buy finished compost by the bag or by the cubic yard. Local landscape supply yards in Cedar Falls and Waterloo sell bulk compost that is screened and ready to spread. It is usually cheaper than bagged compost from the big box stores. A cubic yard covers about 100 square feet at 3 inches deep. For most residential landscape beds, a few cubic yards is enough to make a real difference. Spread it in spring after the soil has warmed up, and again in fall after you cut back the perennials.

Applying compost is straightforward. Spread a 1 to 2 inch layer over your landscape beds and work it gently into the top few inches of soil. Avoid digging too deep around established plants. Their feeder roots are in the top few inches of soil, and you do not want to damage them. A garden fork or a hand cultivator works well for working compost into the surface. For lawns, you can top-dress with a thin layer of screened compost, about a quarter inch, after aeration. The compost falls into the aeration holes and feeds the roots directly. That is one of the best things you can do for an Iowa lawn.

Compost tea is a liquid version that delivers the benefits of compost in a form that plants can absorb immediately. You steep a bag of finished compost in a bucket of water for 24 to 48 hours, stirring occasionally. The water turns brown with dissolved nutrients and beneficial microbes. Strain it and apply it to your plants and lawn with a watering can or sprayer. Compost tea is not a replacement for regular compost application, but it is a great supplement for giving your plants a mid-season boost. Use it when you see plants starting to flag in the summer heat.

The long-term benefits of regular compost use are dramatic. Soil organisms multiply, creating a healthy ecosystem that cycles nutrients naturally. Earthworms move in and do the tilling for you. The soil structure improves year after year, becoming looser and more absorbent. Plants grow stronger and need less fertilizer because the soil is feeding them what they need. In the Cedar Valley, where we garden in everything from pure clay to sandy river-bottom soil, compost is the great equalizer. It makes every soil type better. If you have never added compost to your landscape beds, this is the year to start.