Hi: Will Calandrinia spectabilis grow and bloom well in the ground in Houston (zone 9a)? Our summers are long, hot and humid. The native soil is clay, but I can amend it according to your advice. Thanks! Dave Sherron
Yes. They are native to zones 8 and above!
https://www.gardeningknowhow.com/ornamental/flowers/rock-purslane/rock-purslane-care.htm