I'm sure everyone is familiar with the white birch trees and how beautiful they look with the bright white bark. But what causes it to become white? Is there a way to artificially induce the bark to become white? I'm asking because I've got a couple of dozen seedlings I wanted to use for Bonsai, and though they are nice looking small trees, I'd really like to be able to accelerate the whitening so I could have a display of a grove of somewhat small ones. I'd think a display with half a dozen small white birch, a young dwarf Alberta spruce or two, dwarf junipers, and Japanese Maples would be exquisite. But while I can get dwarf JMs, some with tiny leaves, some hollies, boxwood, cotoneaster, several different dwarf conifers, and can even get some nice tiny leaved ground covers - and, of course, moss, the thing I'm lacking is small white birch that are white. Any information would be appreciated.