hoya dropping leaves
I have had a large hoya pubicalyx for over 30 years. It is a beautiful plant but has been losing many, many mature leaves since i have brought it inside for the winter. The mature leaves are turning yellow at the base end and falling off. The leaves are not turning yellow at the tip of the leaf and falling off. It is actively growing now as it has many growing vines and the new leaves on those stems are fine. It's in a 16 inch(or more)plastic pot on a fern stand. the base of the plant is woody but it does grow vigorously and has may long vines and has flowered many times over the years. I have not repotted it in many years but i have top-dressed the soil with new soil. it gets morning to mid day sun in an eastern window and i have cut back on the watering for the winter. I probably have to repot but i do feed my hoya when i water it. My hoya is also getting some gentle bottom heat. Any advice or help is appreciated. I don't want to lose my old friend!