Never observed this before with basjoo in grow zone 5-6.
I and other local growers had a winter kill of many of the large rhizomes of their basjoo however small plants and tubers were unscathed and finally emerged in June almost 30 days behind schedule.
So this year the plants are small/new and just beginning to break waist-high .
Those large dead corms took a lot of garden space and were no match for the tiller.
I refreshed the soil by removing the small plants and rototilling the rich woodchip mulch and amendments to create a new fresh planting area that should be good for a few more years.
Mekong Giants seem to be unaffected and are still unremarkable.
Note the late summer emerging growth(looks like a rat tail) that was stopped by a hard winter freeze on this mature rhizome.
Spring Basjoo rhizome
by
Hostafarian,
on Flickr