Im in Southern California and there are a lot of open fields near me with tons of tall grasses and weeds. I was going to go cut some to feed them to my guy later (not worried about pesticides). I was just wondering though if most likely any tall grass or weed I find out there should be safe or if there's anything I should look out for. Something like mustard plants I was thinking to avoid, but all other grasses i saw seemed like they looked good. Thanks