Wintering tropical Hibiscus
We have 3 tropical plants that we are trying to carry through the winter. We have placed them in the bathtub of the spare bathroom and have a 60 watt grow light on them about 12 hours each day. We lightly water them every couple of days and the plants are losing leaves and have a number of yellow leaves. We just put the grow light on them because of the yellow leaves and lost leaves.
The room does get some diffused sunlight each day through the small West facing window, but another building blocks the sun by mid afternoon and of course, the sun is now quite a ways to the Southwest.
I would appreciate suggestions for how to care for them and if we are neglecting anything with them. We are not fertilizing at all.