Follow these simple steps to create your own self- watering (technical term: subirrigated) pot and come home to happy plants. A reservoir at the bottom allows more time between waterings, while an overflow hole prevents overwatering.
- Start with a thin-walled, nonporous pot (at least 12 inches wide and 16 inches high) that has no drainage hole but will be easy to drill into—like the plastic ones shown here (Skörd planter, from $30; ikea.com). Drill a 1/4-inch- wide hole into its side, about 4 inches up from the bottom.
- Take a smaller plastic pot— roughly 6 by 6 inches—and drill 1/4-inch-wide holes, a few inches apart, into the sides and bottom. Fill with potting soil, then center in the bottom of the large container. (If your large pot is wide, like the one shown above right, use two small pots.)
- Cut a disc of sturdy plastic (we used the lid of an old storage bin) to fit securely in- side the large pot when sitting on top of the soil- filled one. Drill 1/4-inch holes, an inch apart, in the disc. Cut a 1-inch-wide hole near the disc’s edge, then place the disc on the pot, inside the large container.
- Cut a length of 1-inch PVC pipe that’s slightly longer than the height of the large container. Cut the bottom of the pipe at an angle (so it won’t clog), and insert the pipe through the 1-inch hole in the disc. Push pipe as far into the big pot as it will go.
- Set your plant on the plastic disc (next to the pipe). Fill in the space around it with potting soil, mixed with some controlled-release organic fertilizer, to 1 to 2 inches below the pot’s rim. (Don’t worry if some soil falls through to the reservoir below.)
- Cover the top of the soil with plastic sheeting, cutting an X in it to let the plant through and tucking it down into the sides of the pot. Hide the plastic with a layer of rock or bark. Pour water down the pipe until it flows from the drainage hole. Refill as needed, likely once or twice a week.