Note the wide-open space in the middle. The biggest, healthiest-looking rhizome actually grew the worse in the new soil. It looked like it was on a downhill slide, so I decided to dig it up and do some leaf pulls before it died. I didn't have much hope for success because the leaf stubs were pretty small, just 0.75-1.25 inches / 19-32 mm long. I should know by now never to underestimate a flytrap's will to survive. Here is the pot of leaf pulls 6 weeks later:
That's a 4-inch / 10-centimeter square pot with 20-25 leaf pulls. It looks like almost every one got a strike.