Trees are found near watercourses. Most of the other land was cleared for grazing. Previously, there would have been a sparse covering of small trees and tough shrubs.
Nowadays, much of the agricultural prosperity of the western slopes and plains derives from irrigation.
The use of laser-graders has vastly improved the use and reuse of water.
I still have mixed feelings about irrigation per se, but with only normal rainfall, this garden would not be possible...
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