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Hedychium planted deep for greater hardiness?

The mail order supplier of my Roscoea beesiana recommended planting them 12" deep so as to be hardy in zone 5. I was a bit skeptical but it appears to have worked as they have made it through 2 winters.

Now, if a little R. beesiana (12" tall) can push up through 12" of soil, could a 4' Hedychium do the same? Has anyone tried this in order to get Hedychium further north into zone 5 or 6?

Simon

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