tree disease

Question

What is causing my jacaranda tree to not flourish – i.e. few flowers and spasmodic new leaf growth?

Answer 1

First, make sure your jacaranda tree is growing in an appropriate environment for the species. Jacarandas need well-drained, preferably sandy soil, and they flower best if their soil is not very rich in organic matter.
https://www.gardeningknowhow.com/ornamental/trees/jacaranda/jacaranda-tree-information.htm

Check this article to see if your jacaranda may have one of the problems discussed here:
https://www.gardeningknowhow.com/ornamental/trees/jacaranda/jacaranda-tree-problems.htm

Also, exposure to excessive nitrogen fertilizer or lack of phosphorus in the soil can cause many plants to flower poorly.