Palo verde is a relatively small tree that reaches a height of approximately 32 feet and a trunk diameter of 1.5 – 2 feet. This tree has a deep root system which allows it to tap into the ground water and survive periods of extended drought and withstand severe flash floods (which occur often in desert washes).Click to see full answer. Also, how deep are Palo Verde roots?Palo verde is a relatively small tree that reaches a height of approximately 32 feet and a trunk diameter of 1.5 – 2 feet. This tree has a deep root system which allows it to tap into the ground water and survive periods of extended drought and withstand severe flash floods (which occur often in desert washes).Similarly, how big do palo verde trees get? Blue Palo Verde can grow up to 30 feet The height and low-water maintenance of these trees makes them perfect for landscaping. The Foothills Palo Verde can grow up to 20 feet. Correspondingly, do palo verde trees have shallow roots? She warns that the foothill palo verde is very slow growing and so drought tolerant that it can rot out with water it gets from irrigation systems. She said their characteristic slow growth encourages people to over water, leading to rapid growth but shallow root systems that let trees tip over in the wind.How deep are roots of a tree?Under ideal soil and moisture conditions, roots have been observed to grow to more than 20 feet (6 meters) deep. Early studies of tree roots from the 1930s, often working in easy-to-dig loess soils, presented an image of trees with deep roots and root architecture that mimicked the structure of the top of the tree.