I just had a similair emergency.. I was bending a plant, and the stem actually snapped off. I decapitated my plant!! There was no way to save it, so I took 2 cuttings from it and hope it roots.. Would a low humidity, or high temp. cause the stems to be brittle? The plants are 3-4 weeks old.

Don't mean to hijack your thread, but since it is the same topic I found it pointless to start a new thread, and it seemed you had gotten your question answered..