This is an issue I deal w as well sometimes. Many plants say full sun, but that would vary depending on if you live northy or southish.
If you are north, those plants will like full sun. But in the southern states, they burn up in the afternoons and appreciate some shade. Some plants just simply go dormant, or the foliage dies back. Then in the fall they come back when the temps have cooled some. So those plants are not good to use where you want something pretty all summer because they disappear. I think this could be hard to put into the database because it would vary. The comments section would probably be the best for people to report how the plant did for them in the summer and where they live. I do think there is a field to fill in the maximum zone for heat tolerance as well as the usual cold hardiness zone. But full sun or not is more varried and may be a matter of soil or water differences or even preference. What I think does ok in full sun, another person may disagree with. Does full sun tolerance mean the plant survives? flowers,fruits? or that it doesn't nee water everyday? the leaves wilt in the afternoon but perk up in the evening? So may difference ideas of what is acceptable for a plant's performance.
