Aaron, how big was that originally? All the barberry I've seen are just clumps...was that hidden beneath the soil line?
This plant was all above ground growth. It is approx. 2.5" near the base. I am a horticulturalist by trade and I work for a landscape contractor managing their plant stock. This means that when we get shipments of hundreds of plants and I get to go through them to see if there's any I like
And like you said, 99.9% of nursery barberries will be clump form (this one was the only one I found out of 200). I really lucked out and hope this will be a nice tree in the future!
It looks like I will wait for the new growth to harden off a bit before any light wiring. Unless there is anyone who has experience with barberries who would recommend differently.