Answer: Jacaranda trees bloom from May through September in your gardening region. They bloom best in full sunshine, with decent soil and good drainage. Water weekly when it's not rainy, and apply fertilizer made for flowering trees and shrubs in spring and summer, even fall feeding (0-20-20) to encourage roots and flowers especially. If you're not doing any of these things, get with it! If the basic factors are all happening, two more suggestions: if the trees are in the lawn and you fertilize it, they may be getting too much nitrogen, so clear a ring around it and mulch that instead of growing grass up to the trunk. Second, prune it a bit. Right now, clip a few inches off the tip of each stem - sometimes that will stimulate them to grow and flower. In January, clip a few inches off again.
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