50 degrees is too cold.

Root temp is what is important. The plant can tolerate well over 100 degrees if the soil temp is less than 70 degrees. Soil temps above 80-85 and it is too warm.

In the winter I will insulate the pots from the concrete floor to keep them warmer, and in the summer I will put the pots directly on the concrete to help cool them.

A plant that is too cold will show strong reds and purples in the tops during flower and stunt. My avatar is a plant that suffered low temps during flower. Looks cool, not so sure it did the plant any good.