There are many ways to make a tree watering system. Some watering systems, while efficient, are unsightly and others are barely noticeable. One of the best ways to water your tree is to install a soaker hose, wrapping it around the base of the tree in concentric circles. Tree roots can extend outward up to five times the height of the tree, so you'll need to water a larger area around the tree, rather than just next to the trunk.
Remove all debris and level the soil around the tree if needed. Spread a 2-inch layer of mulch around the base of the tree, extending the mulched area 1 1/2 times the area of the canopy.
Loop the soaking hose around the tree trunk on the ground, starting at a point one-third to halfway under the canopy of the tree between the trunk and the endpoint of the tree's branches.
Coil the soaking hose around the tree trunk in circles about 2 to 3 feet apart until you reach out about 1 1/2 times the area of the canopy. Secure the connecting end of the garden hose to the ground using a large landscaping staple.
Connect the garden hose to the soaker hose using the quick connect. Then, connect the garden hose to the outdoor faucet using the adjustable flow valve. Set the adjustable flow valve in the closed/off position.
Turn the water on and slowly open the adjustable valve. Walk over to the tree and check for proper water flow from the soaking hose, which should be a fast dripping action rather than a continuous flow.
Turn the water off at the faucet when you are satisfied with the soaking rate. Mark the position of the lever on the adjustable flow valve to use as a reference for setting the desired flow rate.
Cover the soaking hose around the tree with mulch. This will help to keep the moisture in the soil around the tree and hide the soaking hose.
Turn the water back on and make sure that the flow does not displace the mulch or create a puddle around the tree. Readjust if necessary.