I just planted some heritage raspberries a couple of days ago. I got these from a local nursury. The plant is currently about 12-18" tall, and appears to have a few small buds on it.

Should I cut these to the ground now, or am I too late for this season? If I prune them now, will I still get a late summer/fall harvest? I'm not concerned with missing out on 2nd year fruit if it will still produce later in the summer.