I planted it this spring. It's two culm division, around 5 feet high. It didn't grow much in pot last autumn, yet it started branching out and got somewhat fried before the winter came. I've seen it did grow few rhizomes (started circling around the pot) but all of them had burnt tips due to harsh winter we've had this year. I hoped I'll see it shoot, but I've had no idea how much shoots I can expect.
Now it finally started. I was happy to see one shoot. Next day another one, and another, and another, (at least 5 up to now)... all of them seem to be around the size of division's culms which is superb, considering it was kept in pot and stayed outside almost whole winter. Shoots are creamy white with pink sheath blades. Very nice looking shoots, hopefully it will bush out this summer. Foliage is quite damaged at the moment, I hope it replaces it soon.
It seems that Shiroshima can be quite a prolific shooter. I have Pseudosasa japonica that was bought and planted at the same time and it seemed much healthier and established. Until now... It's shoots got damaged by late frost and will most likely have to wait a few months to continue.
Happy, happy day