Anyone can edit the information. I got my information from nurseries and growers not plant tags. Mainly Google searches. Sometimes I get different, conflicting,information so I just average it out and stay well within the boundaries. If something said hardy to zone 8 then I don't buy it because that would be the edge of my zone. I want zone 7 plants so if and when we dip down lower than normal I will not loose plants. Also on the flip side like heat tolerant plants, I want stuff that is hardy to zone 9 so when our thermometer rises higher than normal my stuff is still ok. So you would want heat tolerance to zone 8 and cold hardy to zone 6 and you should be safe and if you use tags or internet you should still be ok, most of the time.....I think.
