Hi Wendy,
     Not to overlook the fact that nyger seed is expensive and may often produce 
  messy areas under the feeder, the fact is:
     "(I)imported niger oilseed, are heat sterilized to prevent germination of 
  these weeds. Very rarely, a fertile Nyjer seed may sprout a yellow flowering 
  plant under their feeder and this is indeed Guizotia abyssinicia. This is not 
  cause for worry as is won't last long; this seed does not grow well in any 
  part of the United States. Simply remove the plant to prevent it from escaping 
  and competing with our native plants." 
     However, there is NO other seed that yields such a large number of wintering 
  finches!
  Best wishes,
  Lance

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