Dave it has come to my attention that there is a glitch in the sempervivum database. Not sure if this carries through to any other plants in the database.
If some one does an update on a databox it is sometimes changing the growing zone information without manually making that change. I tested it out after sandnsea2 made some proposals to add humidity tolerant to some of the sempervivum.
I backed out without making any changes to this entry.
Hen and Chicks (Sempervivum 'Zorba')
I think I see where the problem is. Somehow there are two growing zones for some of the entries.
If you do an update to the info it automatically leaves the zone 5 growing zone for the new information.
Is there a way to make all Sempervivum entries have only zone 4? I'm not sure how many have two zones entered, or how that came to be. Could it be something in transition of the database to ATP?
