Build a Compost Screener

Prevent rocks and plastic from getting into your compost by creating a compost screener.

June 28, 2011

Some organic debris breaks down quickly into compost, while twigs and hedge trimmings lag behind. This compost screener allows gardeners to remove the chunky, unfinished bits from compost that is to be used in potting mixes or as a soil amendment or topdressing. It also removes stones and plastic trash that may have found their way into the compost pile. Use a gloved hand to work the compost through the mesh, one or two shovelfuls at a time.

The screener is designed to sit atop a wheelbarrow or garden cart; the screened compost ends up in the wheelbarrow so it can be transported to wherever it is needed. Materials needed are 2-by-4 untreated framing lumber, galvanized hardware cloth with 1/2-inch square mesh, 2 1/2-inch galvanized deck screws, and 3/4-inch galvanized staples.


Begin by measuring the wheelbarrow. The dimensions of the wheelbarrow tray will determine the lengths of the 2-by-4s. Cut two boards about 16 inches longer than the width of the top edges of the tray, allowing them to overhang the edges 8 inches on each side. Cut two shorter boards about 8 inches less than the cross dimension. (The screener can be built so the overhanging boards extend to the sides of the wheelbarrow, or to the front and back. A rectangular shape is easiest to construct, although it’s also possible to match the tapered shape of some wheelbarrow trays.)

With a handsaw or jigsaw, cut long notches at each end of the longer boards. The cuts can be angled or curved with a jigsaw, if desired, to make the screener fit more snugly atop the wheelbarrow. Check to make sure the notched boards fit the wheelbarrow tray. Assemble the four boards with 2 1/2-inch deck screws.


Cut a rectangle of hardware cloth to fit the underside of the screener. Attach it with a staple gun, fastening about every 6 inches.

Using Screened Compost
Three good uses for screened compost:

Lawn fertilizer. Spread about 1/4 inch of screened compost on the lawn in early fall. Use a leaf rake to distribute it evenly.

Mulch. Blanket the soil in planting beds with an inch or more of screened compost. As mulch, compost offers slow-release nutrients and a tidy appearance.

Potting soil. Fortify houseplant or seed-starting mixes with compost, adding one part of screened compost for every three parts of commercial potting soil.

New for your e-reader or tablet: Compostology 1-2-3.