I kept my dipladenia plant in the house over the winter and then when it got warm I put it outside. It looks really good but I wonder if I should cut it back. It has quite a few long vines and I don't know if it flowers on new growth or if it will flower on the old part. Thank you for any help you can give me. Don't know if I spelled the name right but it is like the Mandevilla plant. Thanks again. Ellen
Certified GKH Gardening Expert
You certainly can pinch back or trim the plant to encourage more compact growth.