WarrenF
Gold Member
Seeds of this weed are a common ingredient of bird feed that many people put out in their backyard feeders. I quit using the cheap stuff and switched to sunflower seed. No more thistle.
I could be wrong.....but I believe that a noxious weed, that's seed is incorporated into bird seed, by law must be sterile. One other thing, niger thistle seed is different than the thistle that is being discussed.