I live in New York state and the weather here doesn't get warm enough for my mandevillas until June, which doesn't give them time to grow and flower from being dormant for the winter. Can I put them under grow lights now to kick start them? And what kind would you recommend? I have them in my cellar and want to see if I can get them going so by June they will be ready for outdoors.
Kick Starting Mandevillas
Certified GKH Gardening Expert
Yes, you can give your Mandevilla a start before the weather warms enough to bring outdoors.
Bring it into a bright location and wait for it to break dormancy. Do not introduce to much heat, make the transition gradual.
When you began to see new growth you can began to resume normal watering.
Here is a link with more information.