Yes. Deep watering that reaches the root zone, usually 12 to 18 inches down, builds deeper roots that hold up through drought, heat, and wind, while brief surface watering wets only the top few inches and keeps roots shallow.

Why does surface watering weaken an established tree's roots?

Because roots tend to grow where the water is. Shallow watering keeps them near the surface, where soil dries quickly, so the tree is more exposed to drought, heat, and wind, while deeper roots reach soil that holds moisture longer.

How often does an established tree need deep watering?

Less often than a young tree, but still deeply. A mature tree is watered when the top few inches of soil are dry, with about 10 gallons per inch of trunk diameter applied slowly so it soaks in rather than runs off.

How can a large tree be watered deeply?

Slowly, around the dripline, the ground beneath the outer edge of the branches. To carry water below the surface of a well established tree's root zone, 5 to 6 Deep Drip 24" Tree Watering Stakes are driven into the ground around it.

Frequently Asked Questions

Does a lawn sprinkler water a tree deeply?

Usually not. Brief, frequent sprinkling wet only the top few inches of soil.

How long should a soaker hose run?

Several hours, laid around the dripline so water seeps slowly into the soil.

Can the time between deep waterings be stretched?

Yes. For up to 3 months after each application, Hydretain Root Zone Moisture Manager, sprayed from a hose end and watered in, reduces how often watering is needed.

Does deep watering affect soil compaction?

Yes. Deep watering helps prevent surface compaction, which can suffocate roots and limit their uptake of water and nutrients.