Without flowering it’s impossible for a fruit tree to produce fruit. If the tree flowered in previous years but not this year, then it is either something you did that contributed to its lack of flowering or something inherent to those varieties of fruit trees.
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Plants like mesquite, palo verde and acacia are xeric in their water use. They use less water than alternative trees and shrubs and are controlled with applications of water.
Once a landscape design is finished, the amount of water it needs is fixed. You won’t be able to change the amount it needs, by much, without removing plants or changing them.
Weed control is the No. 1 pest problem for farmers. Pests include insects, diseases and weeds, not just insects.