I have seen tons of yucca rostratas here and some of them are definitely different varieties. I know of one not to far from my home that has leaflets that go out well over 3 feet and its a giant (almost 2 stories tall!). I cant remember where I saw it, but I am looking for it so I can take a pic. Rostratas are pretty good with rain. Lots of rostratas bloom around here also which means that they must be happy.

Mine was in a container that never drained properly so it often was completely submerged in 3 inches of water. It lived like that for 3 years before dying from way too much water. They, of course, do best in well draining soil so if you live in a place with a lot of rain, make sure the soil never stays too wet by your Rostrata, especially in winter time.

-Alex

I live in Springfield, IL. Some winters it doesn't get above freezing for weeks. But I remember seeing a picture of one in Chicago IL which has comparable whether and they said they just blow the snow off the leaves when it snows.