Tibouchina Dying One Stem At A Time

Question

Hi: I have T.urvilleana that have thrived in plastic pots in full sun in Houston until about a month ago. They’re in an azalea mix, and I’m careful with the water. Yet, the plants are dying, but it’s not uniform. One entire stem dies slowly, while the others keep growing and blooming for now. I’ve seen this happen with this species in the ground as well. What the hell can I do? Please post  Dave Sherron in Houston

Answer 1

Typically, this is attributed to two different diseases. Phytopthora root rot and Verticillium wilt will be most common. Here are some articles that will help you to deal with these situations:

https://www.gardeningknowhow.com/plant-problems/disease/what-is-phytophthora.htm

https://www.gardeningknowhow.com/plant-problems/disease/verticillium-wilt-treatment.htm