The plants are cat grass like you buy in the pets store and the stem near the corn is sweet basil the herb used in cooking. Thanks for sharing the video .It has some really interesting ideas
I have used cork slabs with my birds for a long time. I got them at a garden center, used for mounting air plants. Birds will chew the cork into pieces, but, not eat it. I'd think that any untreated cork would be fine, like for reptiles or rodents. I also give my fids wine bottle corks to chew. Now, even though the birds will not eat the cork, there is a possibility that they could swallow a piece, and that could be a problem. I've used cork for years, with many birds, without any problems. And being natural & organic plant material, I think they may even be able to digest a bit of cork. But, like everything else that we introduce into their environments, we must watch carefully for any situations that could arise.