These types of planters require less watering than traditional planters. Flow-through planters have an impervious bottom with a porous pipe that drains water after it has passed through the soil and been filtered by plants. Infiltration planters have a pervious bottom that allows water to infiltrate into the ground below. The document provides instructions for constructing both types of planters using common materials like planters, gravel, soil, and PVC piping. Both require connecting the planter to a downspout to direct roof runoff into the planter.