I was at Jim Gremels place a little while back when Ted Matson and I drove some trees up from so. Cal to no. Cal to be taken to the east coast for the national show in Rochester.
Everybody should try and make a visit to Jim Gremels place. Everything is awesome (And I'm a picky bastard)!. All kinds of material from oaks he dug on his property to potentilla's that rival the ones you see in the kokufu books in the shohin displays.
He has large and tiny trees in all stages of development. His blue atlas cedars are so dark blue, they look spray painted.
Oh, and don't get me started on the pots he makes.
His material is very, very expensive (worth it), so I look at it like visiting a zoo-- just look and enjoy.
I hope that in the future, the USA will be full of artist's like Jim and Boon and my teacher, John Wang. We will then certainly be in the forefront of Bonsai.