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who ever comes up with a blue hardy should be able to retire in comfort, however there are some very pretty colors among the hardies. among the many hues and variations of the hardy colors are some very interesting ones. many of them have more than one color and/or change with each passing day. and if you've never seen colorado and similar 'peach' colored varieties, then you've certainly missed something. there are definitly some beauties among the hardies, just not any blue/purple ones
What kind of summer high temps do you get in Michigan? If you put them in an above ground metal tank in full sun, the water heats up quite a lot and you get some nice blooms. At least I do here in Maryland. You can overwinter tropical lilies, either under grow lights or in a dormant state. If you really want a blue or purple, give it a try!