An easy way to start plants. Simply wet the wafers and in a short time they expand to 7 times their 1/4" compressed thickness. Drop a few seeds on top and place in a warm room; you'll be surprised how quickly the seeds sprout. Continue to give them light, heat and moisture until time to set the cube out in the garden. No setback from transplanting. Cubes measure 1-11/16" x 1-11/16" when expanded.