We did this with hardy lilies about three years ago and I still have them in their pots. We used rubber maid totes so there is a good load of clay/mud. We added one evergreen tree fertilizer stick. We put in three totes and will get about 8X8 coverage in pads and lots of flowers in 8 feet of water.

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7/8th of an acre, Perch only pond, Ontario, Canada.