bamboo is prohibited for import into the usa in any form - plants,seeds, rhizomes, culms etc so if the border folks are on top of things, you'll lose it at the border, so canada may not be a good idea. feel like driving to detroit? i know of a supplier there but you'd have to go the long way to avoid customs again.

Good catch, Hillary, If I'm not too late, pls do not cut anything off, you're liable to cut too much off & the plant will collapse if you cut into its crown. Looks like you got it just in time. Rina gave good advice, I was going to suggest the cinnamon too. I don't usually wash the roots, I crumble the soil off dry. But washing it here actually allowed us to see you DO have some viable roots there; seems all is NOT lost. Sprinkle the Cinnamon on the roots, then pls pick the plant up & shake off the excess. Then pot it up DRY & pls do not water it for 3-4 days at least to allow the roots to heal any injury from them being handled. Perlite will definitely work in place of pumice, don't know abt the gravel, it may be too big. After all is done, just as curiosity, wash off that netting thing & pls see if you can spread it open btwn your fingers. I think it's some kind of synthetic mesh; they don't usually degrade over time. I don't know what these nurseries are thinking; but I'd be curious to see it clean, splay out btwn your fingers. Its presence would explain why the pups are pushing up & out thru the center of the plant, instead of the regular coming out from nearby or underneath the mother plant. I recently repotted a ZZ plant plant, only to find a large piece of screen stuck to the bottom of the plant's roots. One never knows what one might find. Great save!! We look forward to updates in future.

Skinny flowers spikes are certainly similar

I was trying to look at the soil line- you can't see really clearly through the weeds, and if it's been that matted and damp in there for too long and it's buried too deeply... Those weeds trap moisture and provide cover for creatures that could have munched your tree's bark and allowed an entry for disease. That'd be my guess.