- 1). Measure the diameter of the tree's trunk at a point 2 feet above ground level. Every inch represents 10 gallons of water that the tree needs regularly. Garden hoses, set at medium water pressure, release 10 gallons of water every five minutes. Use the formula when determining how much to water your oak.
- 2). Lay a soaker hose around the drip line of the oak. The drip line is located directly underneath the ends of the branches. Allow a slow stream of water to drip into the soil overnight via the hose. Because the water is being released slowly, it is absorbed deep into the soil--promoting the roots to grow downward.
- 3). Plunge watering spikes at least 12 inches into the ground along the drip line of a newly planted oak tree. Attach a one-liter bottle of water to each spike and adjust the spike's flow rate to slow. Use as many spikes as you need to ensure your tree gets 10 gallons for every inch of diameter. Each gallon equals 3.7 liters.
- 4). Wrap a burlap sack around the end of a hose and place around the drip line. Turn on the hose for a few hours and move hose to the opposite side of the tree. This accomplishes the main objective of deep root watering oak trees: soak the ground without washing away top soil. You can use a towel or cloth to block the force of water rushing from the hose.
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