i ihave no idea. some of the uneaten birdseed(by the birds) comes up in my garden but not much sprouts it seems. it may be sterilized...i know that nyger seed is sterilized.
bermuda grass is an excellent source of food and i have some of that coming up as weeds in my garden and i harvest it for the torts. once bermuda grass takes hold, it is FOREVER!
if you send me a private email with your address i will send you some of the seed mix (approx 8 different grasses) i have on hand. my email is [email protected]