Chitalpa trees are a hybrid cross between the Desert Willow and the Catalpa tree.
They are fast growers, requiring full sun and low to moderate watering. Grows to a height of 25 to 30 feet at maturity.
Covered with white, pink or lavender flowers all summer long.
The planting of the Chitalpa tree has recently exploded in the desert Southwest, as a tree that flowers all summer long is definitely a plus in the desert landscape.
There have been complaints of yellowing leaves and premature leaf-drop with the Chitalpa, when the summer heat is at it's worst.
A possible cure can be found at the link below.
Insects, Pests & Diseases