Heavenly bamboo shrub fell down

Question

Due to a freak winter ice storm, a large heavenly bamboo shrub in my yard fell over. It’s about parallel with the ground now. I’m wondering if I can cut it back almost all the way to the ground and see if it will regenerate upright, or whether I need to dig it up and get rid of it altogether. It’s big—probably around 5 feet tall.

Answer 1

Pruning is generally done in late winter or early spring, but pruning now will certainly help you get your Bamboo back in order.
You can cut back the entire plant and it will grow back from the roots.

If you can prune in a more normal pattern for this Bamboo, these instructions will help you that.

Layer your nandina shrub, using a modified Japanese-pruning style, for a light, airy look. Begin by removing one-fourth of the canes at ground level, selecting from the oldest canes.

Cut back one-fourth of the canes to one-third the height of the shrub, selecting randomly throughout the nandina bush. Make height-reducing cuts just above a tuft of foliage.

Lop off another one-third of the canes to a height of two-thirds the height of the bush.

Leave the remaining canes unpruned. Layer-pruning provides foliage in layers from ground level to the top. Berries are especially showy on layer-pruned plants.
https://www.gardeningknowhow.com/ornamental/shrubs/heavenly-bamboo/growing-heavenly-bamboo.htm