Overwintering Coleus Cuttings
I have been overwintering coleus cuttings in vermiculite every winter. I pot up about 8 and generally only 2 make it. I have them under lights (16 hrs) in my cool garage. About this time of year the bottom leaves start turning brown and falling off. I water them with rainwater when they get dry. Should I feed them? I've heard not to put them in potting soil to overwinter. I did that one year and they all died. I would like to rescue them from turning brown. I'm thinking the garage doesn't get below 40 degrees F. Any suggestions?
Certified GKH Gardening Expert
This article may be of some help: https://www.gardeningknowhow.com/ornamental/foliage/coleus/overwintering-coleus.htm