Knowing the drip line of a tree is important for three tasks in tree maintenance for every homeowner mulching, fertilizing and watering. The approximate root zone where mulch is laid, fertilizer is applied and water is sprinkled is determined by the drip line of the widest part of the tree canopy. The dripline is the area directly located under the outer circumference of the tree branches. When the tree canopy gets wet, any excess is shed to the ground along this dripline, much like an umbrella. This is also known as a trees critical root zone (crz), sometimes also called the root protection zone (rpz). this short video by drip depot demonstrates how to set up a drip irrigation system for trees. This kit uses 14 drip line to create tree watering rings. install a drip irrigation system for your trees and bushes. Save water and cut down on weeding by installing a simple yet effective drip irrigation system. how to make sure newly planted trees and trees in tree pits are watered properly. expert tony sarah gives sue billings watering tips for watering citrus trees. Can i create a homemade drip irrigation system for trees? Yes! With a 5-gallon bu cket or even a large garbage bag, you can make your own tree water ing system in just a few steps. Any tips for using a drip irrigation system for trees and shrubs? Check the system about once a month to make sure its not clogged. Trees and shrubs require drip emitters that water their surface roots, which spread out under the soil. Place two 1-gph emitters 12 inches from the base of a tree or shrub 1 to 5 feet tall. Generally, younger shrubs and trees should receive higher rates of nitrogen than mature plants. For shrubs and trees in lawns, follow the fertilizer recommendation rate and timing for the turfgrass.