I learned this the hard way after pulling bird seed weeds for 3 years.. Then when I was breeding canaries one of the fellow breeders asked if I had problems with the seed sprouting in the cage tray. When I affirmed that, that's when he told me to just roast the seeds for a few minutes & that kills the seed germ (the heart of the seed that sprouts). I asked if it changed the nutritional value and he said that it was a negligentable amount. Works like a charm with the cheap bird seed.
