I just published my notes on Growing Kitty Grass: https://anaulin.org/blog/growing-kitty-grass/
@anaulin I was right with you up until the last line.
Wheatgrass makes cats vomit?! Maybe I don’t want to try this at home.
@CaitlinWaddick Yes, it might make your cats vomit. I think at least one of mine likes it because that's how he brings hair up more easily.
@CaitlinWaddick But he's already a pretty vomit-inclined, anxious kitty, so YMMV. But even if they throw it up, it doesn't really make them sick (see e.g. https://m.petmd.com/cat/wellness/evr_ct_eating_grass ).
Our vet said once, vomiting for a cat is like sneezing for a human. There is more cleanup with the vomit tho.