Watering Large Trees: Soaker Hoses Beat Deep Root Spikes

Tree roots concentrate in the top 12 inches of soil. Deep-root watering spikes bypass the absorbing roots. Better methods:

• Soaker hose: Lay under the drip line (branch tips) where feeder roots are densest.
• Sprinkler: For multiple trees, apply ¾ inch water (measure with tuna cans).

Minimum Weekly Amount

15 gallons per inch of trunk diameter. For a 20-inch oak: 300 gallons/week.

Surface irrigation matches root biology; deep spikes waste water.