Raspberries are crazy effective at spreading out. I took one tiny bush, split it in four and planted them in a row in on the property line in the front yard. In 2 years it has filled the 8 feet it occupied, and we got quite a lot of raspberries from it last year already. I think I remember reading that raspberries don't grow fruit until the second year, so the harvest should be quite a lot bigger this summer.
On the broody front, Karin said Wilma seems to be starting to sit on the nest. We might still pull this chick thing off.