I had one of these for several years. Beautiful blooms and can take our high heat. However, it's not extremely cold hardy. One winter it got really cold and it succumbed. I've heard 25° to 30° on its hardiness, but mine survived temps lower than 25° before that front that got into the mid-teens finally wiped it out. I never saw my hummingbirds nectaring at that plant, but maybe it depends on the species of hummingbird.