I bought two in HD in full leaves as well. I planted them in a medium width tall pots made from plastic bottles with some bottom less pots on top(look at the picture here Caroline vs Anne raspberies - #11 by Ortegojeffrey) , and I will let them grow as much as they want until the weather cooperates. Last year I bought a plant that was in the small pot for long time. It was still alive(barely ) when I bought it. It didn’t survive. So I guess as soon as they started to grow, they need to be planted.