I have a very small juniper (juniperus communis) that I dug out of the ground and potted the other day.
However, it looks quite messy and I wonder when I can start to prune it after the shock of being transfered from the wild to a pot?

Pictures, please.
Usually one should wait after collecting at least until next Spring.

Once you get runners of 10+ cm you rtree is back to optimal health.