@xochiquetzl_xkvn idk how easy/hard it would be to implement, but I think it might make sense if Plant Sims had aspirations or moodlets related to environmentally friendly things - like cleaning up Sulani or improving the Eco Footprint of neighborhoods. Maybe a chance for positive moodlets in the Island Conservationist and similar careers, or something related to the activism in the Politics career track?
I just think in terms of immersion, Plant Sims need to be fleshed out more. Kinda like Island Living did for mermaids and Sulani residents - stuff like the Child of the Ocean/Child of the Islands traits, and the siren abilities of mermaids. Something equivalent to Sulani Mana for Plant Sims might be cool (it just makes sense for them to have, like you said, an ability to improve plants), or an affinity for forests and such (maybe Sylvan Glade?) like mermaids have for the islands. Right now, the closest I can get is giving them the Loves the Outdoors and Likes Gardening traits, which is fine, but it would still be neat if there was something unique to Plant Sims to put them on par with other occult sims.