This was very stinky mud, full of old raccoon poop, since my resident raccoon had been using the tub for a toilet previously. I dumped it out on the ground and rinsed everything with the hose until it didn't stink any more. Then set about untangling the mess of roots and tubers, which are damnably fragile. Yes, it's a miserable job.
I swear I'm not going to leave it that long next time . . .
