Leftover coffee or tea grounds sprinkled about a quarter inch thick once a month keeps the soil pH on the acidic side for plants that need it, like azaleas, rhododendrons, camellias, gardenias, and even blueberries.
Three Garden Tricks Using Kitchen Scraps

Leftover water from boiling or steaming vegetables carries real nutrients into the soil instead of down the drain: spinach water brings iron and potassium, while starchy pasta water helps release existing nutrients already in the soil. Pouring either onto potted patio plants instead makes a noticeable difference.
Acidify Soil With Coffee and Tea Grounds
Dry Herbs Fast in a Hot Car
Laying a sheet of newspaper on a car seat, arranging fresh herbs on it in a single layer, then rolling up the windows and closing the doors dries herbs quickly in the sun's heat, and leaves the car smelling great as a bonus.
Got a handy tip of your own?
Reply and let us know, we love hearing your tips.
This edition is part of the Genius House Hacks archive: 20+ years of tips, rebuilt from the original Handy Hints newsletter. Browse more hacks →