The roots of plants follow water. Where water was applied, you will find roots.
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Black spots on a pluot could be either from the sun (sunburn on the fruit) or, more likely, a nutritional problem.
California pepper tree is evergreen. Evergreen plants constantly drop leaves all season long but drop their leaves heaviest soon after times of new growth.
Kurapia has worked well in covering highway and freeway shoulders, rooftops, public utility areas, commercial properties and solar farm landscapes. But not much is known how it performs in a desert climate.
A fruit tree should be solid in the soil and not wiggle after it is planted. Staking helps but doesn’t replace proper planting.