The Calibrachoa – Superbells® Plum, Calibrachoa hybrid ‘USCALI99’, is a Proven Winner plant, which means that this plant has undergone rigorous testing to be sure that it will perform in the garden under a variety of conditions.It is more heat resistant than most of the Calibrachoas. It can take the heat of our hot southern summers making it a good replacement for petunias, and can be perennial hot zones 7 and warmer. Expect hummingbirds to visit your garden when you plant this variety!* Award Winner* Heat tolerant* Deadheading Not Necessary* Attracts Birds & Hummingbirds .