I can't grow them outside because of high summer night temperatures. They use crassulacean acid carbon dioxide metabolism (C4) and can't breathe when nights are hot. I have several friends here who set up outdoor spray systems to water Tillandsias several times a day. They only lasted until it got hot. I might try some again in my evaporatively-cooled sunroom now that I have an automatic spray system in there.
__________________ May the bridges I've burned light my way.