Cold Temperatures & Aloe

Lately the weather in Texas has been pretty cold, with temperatures dropping below freezing some nights. Even though the Aloe Vera nursery is located inside, the room is not very well insulated. The premature Aloe shown in the picture were effected the most. Their lack of a well developed root system makes them suceptible to the cold, causing their leaves to turn a dull and yellowish hue. The pup on the outer right side appeared to be least effected. It retained the healthiest center out of the three plants with light green fleshy leaves and minimally reduced vigor. The larger plants were slightly effected, class one overall showed the most suceptibility, compared to class two and the mother plant. Slight darkening of the outer ridges of the leaves indicated damage along with slowed growth and vigor. By keeping the potted Aloe closer to the lamps I am hoping the slight temperature increase will be enough to help the plants get back on track