liatris pycnostacia

The liatris pycnostacia will be grown in Iowa in soil similar to where it occurs naturally.  I am trying to establish a production plot.  The pycnostacia seems to be the one type that occurs in the mesic to moist to nearly wet areas locally.  I had heard that the tobacco transplants were grown in styrofoam containers that float on water.  If that would work for the pycnostacia it would solve my two major or rather two of my major concerns i.e. keeping the small plugs watered and having too tender of plants if greenhouse grown.  If I took them to a shadehouse type setting  then the lightweight flats would blow away.Regarding the butterfly milkweed does the seed that is to be soaked in hot water need to be cold moist treated at all? Before hot water? After.How hot of water?  Also is there a broad spectrum fungicide that can be mixed with water and applied safely over the media with seeds planted in?
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