Q.How Long Do I Have To Wait For A Jacaranda To Flower?
I planted it twelve years ago, on the tenth year it produced two flowers only. Then on the twelfth year I have two solitary flowers again. Every year I have a beautiful green foliage,
Certified GKH Gardening Expert
Likely, it has to do with soil nutrient content. Make sure to test your soils for excessive nitrogen. This will prevent flowering. If a soil test reveals that you have too much nitrogen, then you can offset with phosphorus and potassium.
Here are some articles that will help:
Outside of this... Patience is key. It is right in the range of flowering age.