If Euanthe's plan works out, throwing flowers at Devil Jizz users might actually be a viable tactic to neutralize them! If embarrassing for any police or military personnel involved (though maybe they'll shift to wooden bullets or something- Green Arrow can live up to the 'Green' in his name and teach everyone archery with Eden-wood arrows!).
One way I think Euanthe can fit into larger human society and even aid in the interstellar uplift and advancement is by making her halidom a source of magical natural resources, for medicine and other (al)chemical uses, wood, etc. (I'm thinking of Xianxia examples with some pretty trippy plants). She's not like Hyathis or Demeter because she's not defined by human(oid) notions of civilization, but she's an expression of the natural world, so why would she? Instead she could help create entire Nature Worlds and oversee the sustainable extraction and use of magical herbs and plant resources, communing with humans through intermediaries like Isley and the Accala (tribes may not be urban but that doesn't mean they don't extract natural resources or use them, just that it's on a smaller-scale and not (as) prone to exploitation). Odym seems like an example of an idyllic natural world, maybe she could create something like that, or be persuaded to make actual gardens too some degree.
If Paragon manages to get her some wood from Yggdrasil, he could possibly bring his Mother of Mercy-dream of creating a Root of Yggdrasil to allow thaumospheres to develop or propagate in space actually come true, even if it's basically only aligned towards Green and natural magic. Peaches of Immortality from Chinese/Taoist mythology, the apples of immortality and youth from the Garden of the Hesperides (which I think Hera owns) and the Norse Idunn respectively., and so on..Getting her to replicate magical plant-life on a big scale, even if it's reduced in potency to just promoting longevity (I'm not sure if Mother of Mercy actually qualifies as plantlife, and I don't think she and Euanthe have ever met, but that could also be interesting, and maybe a way to introduce Mongul back into the story and deal with him). Forcing human(oid) ideas of urbanization and industrial civilization onto a sapient life who has a totally different mentality, outlook and value system on the world (in a way, more alien than most of the aliens that Paul has met) just seems tasteless and a bit cruel. I know and understand that Paragon wouldn't be interested in this, but the New God Primitives and the Bug People seem like they'd fit in well in the world Euanthe has created. I'm surprised there aren't more dryads and more indigenous nature spirits making a reappearance and running around.
I more recently found out about the Wood Wide Web and how important symbiotic relationships between fungi and plants are, so I think/hope the Grey gets involved, I feel like that would be necessary to make something more self-sustaining- and definitely help in the deterioration and breaking-down processes (Apparently prehistoric trees just laid around for millennia after dying because nothing could consume them, until a fungus evolved to be able to decompose them, and most of our coal comes from those original trees just being deformed under sheer pressure and time). I think Euanthe was negotiating with non-plant nature spirits in Rhelasia when she created that magic forest that would attack people if they felled trees (like mountain/earth spirits she called oreades or something, even if they weren't Hellenic nature spirits), so I think it could be possible.