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Re: sowing in plastic bags

As far as I know, Helleborus and Eremurus of your list, at least, are plants
the seeds of which require (or benefit from) three-stage germination. First a
period of moist warmth (20deg C) of around 4-6wks, then a stratifying period
of 6-8 wks of  minus 5 - +5 deg C, finally a gradual warm-up to 15deg C. 
Eremurus occasionally germinates without only a short period of
stratification.
Plastic bags can be used for the first two stages (seeds mixed with
vermiculite or similar) then spread the contents on normal growing medium.

Hope this is of use...

M.Open, Belfast.
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