I live in Ontario and recently brought my Mandevilla inside for the winter. The leaves are going yellow, then brown. I'm watering only when it's dry. I expect this is normal, but I wonder if I should give it a dose of fertilizer? I didn't fertilize in August at all. thanks
Certified GKH Gardening Expert
No, never fertilize a plant that is going into dormancy.
This article has information on wintering over your Mandevilla.