Drip Irrigation for Trees

Drip irrigation is an efficient way to water plants and trees because more water is absorbed into the root zone. While drip irrigation can be used on small to medium sized trees, it can be impractical for larger trees.

Considerations

Drip irrigation is useful for small trees, those 15 feet or less when mature, and medium trees, those 15 to 25 feet when mature. Trees in excess of 25 feet do not do well with drip irrigation because of their extensive root systems.

Placement

Drip irrigation or soaker hoses should be placed at the drip line of the tree. The drip line is where water runs off the outer leaves of the tree and drips to the ground.

Quantity

On average, trees need 1 to 3 inches of water per week. Trees in sandy soil may need more water, while those in clay soil may need less. The best time to water is at night when evaporation is minimal.

Time Frame

Trees need one or two deep watering sessions per week during the growing season. Water should penetrate the soil to a depth of 18 to 20 inches.

Mulching

To help retain moisture around the root zone of the tree, mulch should be placed around the tree trunk to keep moisture from evaporating.

References

• Warnell School of Forest Resources: Watering Trees
• Utah State University Extension Office: Efficient Irrigation of Trees and Shrubs