At least in the last 2-3 weeks we've got warmer nights too(not days only), and the old group of my basjoo get accelerated.
photo taked on 14th of may
and the same pups a day latter 
))
Except 3 bigger pups 60-70 cm tall(approx 2 ft), you can see 3 other very little pups on the ground, i noticed them on the second day
And this is the new Basjoo, wintered in a pot, and i planted him in a ground last Sunday. I will give actual photos in this thread in the middle of the next week.