I once grew a large plant which developed into a large clump over a 10 year
period. I prepared a large hole in my flower bed. It was 24" in diameter by
1 foot in depth. I placed a vinyl plastic in it and filled it with sphagnum
moss and placed the plant inside. The plant was watered daily with tap water
that had been sitting overnight or with rain water. The plant received
afternoon sun and because of this it was red and green in color. It was kept
constantly moist (bog like conditions). It overwintered in below freezing
termperatures and received snow as ground cover.
Good luck
Rob