Causarina species are considered an exotic invasive species in Florida, they have escaped and have naturalized themselves in the landscape. They like wetter areas, seedlings have sprouted along water ways in many areas in south Florida. Adult plants tolerate dryer soils, but both seedlings and adults grow faster with soils kept wetter than what we would normally do for pines. They definitely do make good bonsai, keep em moist, give them sun and they will take off for you. And remove seedlings growing "wild" in your yard, don't let them mature to the point of making seed, or you will create a plague on the neighborhood. Actually since volunteers are coming up in your yard, your neighbor has already started the plague.