Ups-A-Daisy sets inside your planter approximately 1/2 to 2/3 of the way down into your container. Measure inside width of planter 1/2 to 2/3 of the way down to determine the Ups-A-Daisy size needed. Inserts include drainage holes to help protect against over-watering. Ups-a-Daisy inserts are reusable and extremely strong. With an Ups-a-Daisy insert your potted plants & flowers are sure to have healthier roots, produce bigger & more brilliant blooms, and grow faster than ever before!