I've been taking clones off a mother that I have and something has happened to them. Several of the leaves have started turning black at the ends. The larger leaves have started to turn over, curl up, and get discolored. Out of all the clones I clipped I only got 50% of them to make it. I have never had this happen before however I am fairly new to this as it is only my 4th time cutting clones.

My only thought on what could have happened is that the plants got to cold. The temp in the room could have gotten into the mid 60's. Would that have been enough to kill these clones off?

Thanks in advance for any help!