Last night the NWS had a current temp of 35 at 10 PM at Hobby Airport. I always figure a 1 degree drop per hour with 7 AM having the lowest reading. That was going to be a number around 28. Sometimes that prediction holds and sometimes it turns out that the temp is lower if the air is still and the ground is dry. We have almost saturated soil right now, so that helped as well.
Just 5 more weeks of this Weather Russian Roulette and the threat of VERY severe cold is over.
About 1/2 of Tropical Texana is cold hardy. Lady fern and variegated alstroemeria can take a frost.