My Dipladenia bloomed inside until mid Jan. Now the leaves are turning yellow and dropping off. I don't see any signs of new growth and have not trimmed the plant back or given it any fertilizer. What do I do? Thank you
Certified GKH Gardening Expert
These need to be fertilized once per month until winter. There are many reasons why these symptoms would happen, but this is the usual culprit.
This article will give you more information on the care of these: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/growing-a-dipladenia.htm