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echinacea help

Does anyone know if Echinacea spp are totally insect pollinated?  If so by what size pollinators?
 
My dilema is this.. I have a couple small collections of pale purple coneflowers and a lesser amount of narrowleaf.  These are side by side in rows.  I would like to increase the seed from each but keep it pure.  If they are only insect pollinated is there a netting that could be set up over the narrowleaf and som butterflies inserted or any other solutions other than clipping all the buds off?  Thank you in advance.
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