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Re: Sylphium perfoliatum

Judy Showers wrote:
> 
> I was recently given some seeds of Sylphium perfoliatum (cup plant).
> Would appreciate getting some advice on how & when to germinate them.
> TIA,  Judy Showers (greenhouse grower in PA, z/6)Judy,
I think they germinated for me indoors under lights without 
stratification.  The seeds were barely covered and I just used regular 
potting soil.  If the seeds are set outside, I don't think they will 
sprout until the weather really warms up (60's and 70's).  It has been a 
few years since I dealt with these seeds--I have about 2 dozen plants 
and pull out any offspring that I find.  The goldfinches especially love 
these seeds but unfortunately don't eat them all.  
In spite of a tap root on mature plants that heads for the center of the 
earth, I have successfully dug and transplanted plants that were about 2 
yrs old.  The root seems to react like a dandelion and regenerates a new 
plant if you try to get rid of a mature plant.
Good luck,
Jean Halverson zone 5A, Wisconsin
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