I've got at least 25 divisions temporarily potted (roughly 20 more than I really need here) and a few of my larger rhizomes are going in the ground today. Still a few small ones that I'll pot and that big "mass" to deal with. I'm out of "ground" and running short on pots as of this mornings work. Still sticking to the tree pot plan just for fun, if I don't like the result it's no big deal. The way things are going it's looking like I might need to rent a sod cutter and create another bed, lol.
I've always purchased bagged/named variety cannas and got really nice plants from even the smallest rhizomes. I had so many seedlings come up last year the named variety I planted kinda got lost in the mix so I labeled by approximate color rather than type. Nice rhizome growth on those seedlings too.
The only growing plants I've purchased were some of the Tropicanna series last year. What a mess in those pots! It appeared to be a fresh shipment but they must hold those pots until the foliage is really showy? I'm betting this years divisions will be a little more vigorous? Another observation with those cannas is that they deteriorate quickly in the small shipping pots and end up on the bargain rack at 50%. Pruners and a shovel make them good as new.