I haven't heard of blumats - but definitely interested - we are thinking about installing drop irrigation but these have been good so far. I understand the concern about plastic especially in the heat with its leeching potential.
I don't think we fed plant bolts, just kitchen scraps so I'm presuming it is the seeds from something from the kitchen
https://www.blumat.com/en
Whatever is probably came from an organic source... You probably could treat them like microgreens and eat them once they get their second nodes/4-6 inches long😛