Ask Mr. Smarty Plants

Jacaranda makes a handsome tree, but when it flowers it is spectacular. I can understand your frustration, because 12 years is a long time to wait. However, Jacaranda mimosifolia is a non-native plant from Brazil and Argentina and thus falls outside our area of focus at the Lady Bird Wildflower Center which is  to increase the sustainable use and conservation of native wildflowers, plants and landscapes.

I'm including some links that deal with the growth and care of Jacaranda plants. One thing to consider is whether it is in the right place to flower? Does it get enough sun? Does it have sandy, well-drained soil? It is hardy in USDA zones 9-11, and Oviedo is in zone 10, so that shouldn't be part of the problem.  In some plants, flowering is inhibited if the nitrogen/phosphorus ratio is too high. This can occur when the plants receive the same type of high nitrogen fertilizer that is being placed on the lawn. This link from Growing Advisor can give you some help with this.

Look at these links from eHow and searchwarp and see how your growing conditions compare. You might want to contact the folks at the Seminole County office of University of Florida Extension for help closer to home.