Question: are catalpa trees fast growing?
Answer: The catalpa is a hardy deciduous tree that readily grows in USDA hardiness zones 4 to 8. It has moderate to fast growth, tending to grow rapidly when juvenile, but slowing with maturity. The height at 20 years is about 20 feet. Catalpas prefer moist, deep, well-drained soil, but will adapt to dry or wet soils.