I have had a very healthy Bottle Brush until this winter the leaves fell off. The temperature has been warm and it gets plenty of water but all of a sudden all the leaves fell off. What do I do.
Please see this article on reasons a plant may lose its leaves:
If the plant is indoors, low light or temperature changes are a common cause of leaf drop. Fungal diseases or pests are another possibility, so check carefully for any bugs or visible mold/fungal growth on the leaves or stems.
Also see the problems listed under "environmental disorders" on the right side for some possibilities: