I don't think really the light or the latitude. It's the fact there are more days below freezing in the north and the plants can actually go fully dormant and build a bigger crown. Hard dormants need several weleks of cold temperatures to go fully dormant, and they can't do that in Florida winters. Pat Stamile used to say in his catalogs that he expected his dormants would grow taller in the north. I posted a comment about another dormant bred in the south. Grape Twizzler. It's scape height is registered at 30 inches. But scapes here are always more than 40 inches.
Debra
