Koelreuteria bipinnata again...it's easy to see why people grow it

I was in Annie's Annuals this week and noticed that she lists this plant though it isn't currently available. I'm a person who likes yellow, actually all colors, so there is something appealing about the concept of a yellow-flowered tree, but I have to reiterate how much this plant seeds. Annie is careful to observe that it doesn't self sow in their wet winter conditions. Well it does self sow here!