Q.My dipladenia is not blooming
I bought it at a nursery in May and planted it in a container. It wasn’t blooming then and never has. It has grown quite a bit but no blooms. Any clues?

Make sure your plant is receiving plenty of light. Temperatures should be warm enough.
Here are two links with all the care instructions including fertilizing information.
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/growing-a-dipladenia.htm
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/getting-mandevilla-to-bloom.htm