What to do with your coffee grounds? You can use them straight up as mulch on plants that love an acid soil (azaleas or blueberries anyone?), in potting soil and more. Here are five ideas for using coffee grounds and more:
Coffee grounds have long been a favorite addition to compost piles. But did you know that they are also an excellent amendment to potting soil? They’re lightweight, porous, high in organic matter and attractively dark. Plus, if your soil is alkaline, their natural acidity helps balance the pH. A good source of used grounds is your local coffee shop, where they’re usually happy to give them away.
You’ll be surprised at all the other uses you can find for them.
Grounds make a dark, attractive mulch around acid-loving plants, such as azaleas, hydrangeas, hollies, and blueberries.
Slugs don’t like caffeine, so a mulch of coffee grounds, which retain much of the chemical, will help keep the slugs away from your hostas and other vulnerable plants. Just be sure to spread the coffee grounds no more than 1 inch deep around the plants. In cool, moist weather, an unsightly but harmless mold can form on the mulch.
Keep grounds on hand for mixing into potting soil. Spread them out on newspaper for a day or so to dry then store them in a plastic bag.
If you have grounds from only a pot or two of coffee, add a spoonful or two to houseplants and a cup or two to larger container plantings. Work the grounds lightly into the soil.
Put a paper filter full of coffee grounds in the bottom of a plant container or planting hole to nourish new plants.
Adapted from Yankee Magazine's Panty Hose, Hot Peppers, Tea Bags and more for the Garden: 1,001 Ingenious Ways to Use Common Household Items to Control Weeds, Beat Pests, Cook Compost, Solve Problems, Make Tricky Jobs Easy, and Save Time (Yankee Books, 2005).