Exotic/tropical style garden in USDA 4!!! September, 2020

My exotic garden (tropical/subtropical style) is located near Moscow, in USDA zone 4. In the garden in some zones I use specialy developed technology (insulated transforming constructions installed into the garden) for growing and overwintering of tender subtropical plants without any heating!!! In other parts of the garden I grow and test some hardy and border exotic plants with no insulation at all. FB: VK: