posted 7 years ago
I wouldn't recommend hanging 200 pounds of water on a small tree limb, or any limb repeatedly, because I've seen less than that kill a tree limb. A pint's a pound the world around. Fat raccoons at maybe 40-50 pounds broke enough of my branches to give me grief.
I would also not recommend water trickling down the trunk of any tree because of the grafting spot where the rootstock is joined to the trunk should not get wet and stay wet, except in winter when growth is slow. It is vulnerable to rot. It helps keep that joint dry and healthy by planting that joint facing south (in the northern hemisphere) and it won't be a place where moss and wetness are on the shady side.
I've been thinking of this very kind of watering, because deep irrigation is the best kind. The roots should go down as far as possible, and we've got to get the water down, down, down so the roots will go after it. But I'm thinking of fashioning something with a U-shaped PVC pipe coming out of the bottom of it, with heavy fabric stuffed in the PVC pipe, so the water goes equally to both sides, maybe from a 5-gallon bucket or tall kitchen garbage pail.
And, yes, a tree can be overwatered and the trunk will start to split when it gets too much water at once. It's a tragic sight. Testing the soil below the surface with a finger helps. Clay holds water longer without water than loamy or sandy soil, even if the surface looks dry. There used to be moisture meters on a long probe that really help. If the tree leaves look wilty, then pale that's the first sign of needing water. I have problems with wind and wilty-looking leaves, and putting the hose on either side of the tree perks it back up.
Also check for rodent runs around the base of the tree putting too much air under there and drying out the water we so carefully put there. They are drawn to wet soil like a magnet to metal.
Mediterranean climate, hugel trenches, fabulous clay soil high in nutrients, self-watering containers with hugel layers, keyhole composting with low hugel raised beds, thick Back to Eden Wood chips mulch (distinguished from Bark chips), using as many native plants as possible....all drought tolerant.