Kathleen, Zone 7 or colder seems to be pushing it. A night or two of 20F will not harm them at all, and some even prefer some cold weather in winter to bloom well. But, Zone 7 can get down to 5F. Some of the puyas can go below 20F , but for how long I do not know. Here is a site that lists hardiness from a wide range of bromeliads, including Puyas. http://fcbs.org/articles/… By the way, not many bromeliads are bulbous, or tuberous. Andrew San Diego In reading about South American bulbs, I found several references to Puya (bromeliad) being hardy to zone 7-8. I would like to know what PBS members' experiences have been with this genus. Are some of the species hardy to zone 7 or colder? What growing conditions have been successful? Kathleen Pacific Northwest, in a mild and cloudy winter, unlike much of North America