Here is the result of a Sphag 'n' Bag treatment I used on C. maxima 'Coronita'. It is a large division with few viable roots. It was placed in a large dry cleaning bag with moss in the bottom and some egg crate light diffuser on one side for plant support. It was sprayed down, the bag tied off and hung in front of my fluorescent light set up.
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DaveW
"Every time you spend money, you're casting a vote for the kind of world you want." ~Anna Lappe