Mark Webber's Arboricultural & Horticultural Consultancy                                      Forensic Arborists & Horticulturalist

How to water your trees.

Watering Established Trees
It's a common misconception that a tree's roots are a mirror image of the aboveground canopy. In reality, an established tree's roots usually extend well beyond the edge of the canopy, or drip line. Although some anchor roots may reach deep into the soil, most tree roots are concentrated in the upper 12" to 18" of soil. When watering established trees, provide a deep, soaking irrigation to the entire area beneath the tree canopy and extending several feet beyond the drip line. Ideally, you should moisten the soil to a depth of 10" each time you water. To prevent rot, don't apply water to the area directly around the trunk.

Know When to Water
The easiest way to check soil moisture is to take a long (8"-plus) screwdriver and poke it into the soil. It will pass easily into moist soil, but be difficult to push into dry soil. If you can't poke it in at least 6", it's time to water. This technique works best in clay and loam soils.

How to Apply Water
Overhead sprinklers are the easiest way to cover large expanses, but they're inefficient, losing up to half the water to evaporation. Trees are better served by watering methods that apply water slowly, right at soil level. It may take several hours to properly water a single mature tree.

Soaker hoses are an efficient way to water trees because they're porous and release water slowly. Encircle a tree with a spiral of soaker hose and run it for an hour or more — as long as it takes for water to penetrate 6" or 8", using the screwdriver test.

Source:https://www.gardeners.com/how-to/when-to-water-trees/7931.html

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