Please help my Brugs

I got some cuttings a while back. They were all doing well, growing big, getting new leaves and all, now I noticed some of the leaves are drying up and curling, even falling off. What can it be and how to I fix it?
thanks
tamlamb

Humidity in the air a bit lower in the winter?

Have you brought them inside? Did they get too cold before you did? Cold will make the leaves curl, turn brown/yellow and fall off. New ones will regrow. Do they have spider mites? To check for mites, look on the underside of the leaves for webbing. You can also hold a white sheet of paper under the leaves and flick the leaf. If there are mites, they can be seen crawling on the paper. Have you let them get too dry? Drying out to the point of wilting will cause the leaves to yellow and fall off. They will regrow. Sometimes they just lose leaves because of the change in light. They will regrow new ones for the amount of light they are receiving now.

I never had them outside. I checked for mites but didnt see any, maybe I am not watering enough. The soil seems to dry quicker now then it did before. I will try watering them more & see if that helps any. Thanks
tamlamb

Try misting them also. If you have low humidity in the house you are more likely to get spider mite. JMHO

Humidifier might help? Sorry, I am not much help here.