I once had a P. caerula growing on the south side of my deck, on a slope. I don't actually water it there anymore, it's hard to get to. I grew a couple of incarnatas from seed, and was planning to put them there, I could try to remember to water. I could also put them on the south wall of my house but there is nothing to grow on. I can't think of places where they could be grown under a tree that have as good drainage, is that important?

Can they be planted out their first winter or do they need to be kept indoors over winter?

Will 2 seed-grown incarnates pollinate each other?

I was surprised when they sprouted, I had chilled them in the refrigerator and they weren't sprouting, so I kind of neglected to water them and suddenly they came up!