^ Yes, I too doubt birdseed has tomato seed in it.. but 1) I don't recall throwing some leftover tomato in the garden and 2) the tomato plant grew at the exact spot where the carrots (and other weeds) grew. No doubt the carrots came from the b.seed. And 2.75) one can buy tomato seeds in sachets in particular stores. You know, to grow your own tomatoes at home or where ever. Um, ¾ of a point they therefore could be in birdseed also.
Well, all doesn't matter much.. I just love looking after plants (and free to roam/wild birds too).