That is really beautiful. I picked up a Little Twist at the bonsai show last weekend. It is just at the end of blooming. Any special tips for them? Any special needs as far as soil, winter care, whatever you care to share, I would appreciate.
I bought it bare root from my favorite local garden center nursery. It went directly into that big pot full of nothing more than Turface MVP. I use Osmocote-Plus at the rate of about 1/2 teaspoon per nursery gallon of substrate every 6 months. I get very good root ramification with it. As far as winter care, for me it was nothing more than sit it on the ground (USDA zone 8).
Like any cherry - lots of sun; of course, it looks pretty ratty late in the season. Mine doesn't have much of a winter image because I have it for the early spring flowers. But it can be pruned fairly hard following the first flush and not sacrifice all the flowers of the following spring (i.e., like most flowering species, don't 'mess with it' much after the summer solstice) = standard stuff.
You are not the only one to believe in organic for growth,
@GrimLore
I have grown and continue to grow trees in potting soil, bark, and Turface. In potting soil I tend to get a relatively small number of long roots with poor ramification. In bark and bark+potting mix roots are better ramified, more so in nothing but bark. I like to use this with tall trees like potted 'patio trees' and trees that I am growing as whips because the roots tend to quickly get locked into the pot so I don't have hassles with securing the roots into the pot. It appears to me that the less the potting soil the better the ramification, even though air filled porosity and ramification don't have any direct connection that I know. Roots grown in Turface are much more ramified and finer. I find it interesting how threads of fine roots bloom into thick fleshy roots when they hit the pot wall. I don't know why it is, but am convinced that Turface produces and entirely different root morphology.