If it reflects reality the areas which currently have rules are porn, social media and video games so whatever your mysterious plants are they're unlikely to have restrictions applied to them . Even those controls are restricted to certain geographic areas.
Admirably, in my opinion, the exception to this is Germany, which has gone some way to recognizing that perhaps allowing five year olds watch people having their heads blown off might be at least as problematic as letting the toddlers watch porn, still no mention of pictures of plants though.
I'm not a lawyer and I don't speak German so anyone who's interested in the German rules should confirm what I've said for themselves https://www.landesrecht-bw.de/bsbw/document/jlr-JMedienSchSt...) .
Building something else that doesn't create potential legal liabilities is the simplest thing that might work. I mean this probably isn't the best idea you can possibly have. And probably not the coolest thing you can possibly build.
On the other hand, thinking about legal pitfalls might be your favorite hobby. Good luck.