tropical mimosa

Is it possible to defoliate tropical mimosa trees more than twice a growing season here in zone 11? And does defoliating mimosas reduce their leaf size?

We defoliate Brazilian rain trees a few times per growing season here in central Florida, zone 9. You should have any issues doing the same in your zone, assuming your tree is/trees are healthy. I don't believe leaves reduce in size since they're compound leaves, I could be wrong.