Tropicals & Tender Perennials: A real mystery...., 1 by bwilliams

bwilliams wrote:
I would consider Gigantea a zone 6 plant or higher if slightly protected I have tested it out for 4 winters and it has survived all winters in different areas and different protections. With out much they show up late and usually stay smaller and clumps of many plants if mulched you get very large plants mine are now around 6 feet tall. The trunks survived with a mulching of 8 inches hardwood mulch. After a few years in the ground it seems that mulching may not be needed as much but the first year is very important with all hardy tropical plants.