I live in a city, but I'll share some programs that/organizers who may provide some inspiration:
BMORE Beautiful - provides trash picking kits and helps residents organize cleanups in their neighborhood. They were incredibly friendly, so might be worth reaching out on how to build a similar program in your area
Weed Warriors - trains participants to recognize and remove common invasive plants, provides training for participants on how to organize efforts in their communities
Community gardening - this video is from an animal liberation podcast, but the guest's opening story of being completely ignorant about gardening but doing it anyway is inspiring. The remainder is about their work on food justice and grassroots organizing
Compost collective - this is the podcast of the guest in the previous video. They interview the founder of Baltimore Compost Collective who works with youth in the city
Guerrilla gardening - this is a classic TED Talk. The speaker discusses growing food in a public space and how they successfully fought their city to keep their garden. They also talk about their volunteer gardening group, planting food gardens at homeless shelters
Maryland Food & Abolition Project - may no longer be active, but an interesting idea nonetheless. Their mission was (is?) to partner community gardens with prisons to provide fresh produce
Echoing @poVoq, don't discount seniors! I used to be a case manager for the elderly and many are more interested than people give them credit for.
Only half as much as I observe 😅 I'm not confident enough to ID outside of the Mid-Atlantic, sticking mostly to Erigeron sp, pokeberry, some trees, and a handful of bugs.
I wholeheartedly agree, the community there is awesome! It's so exciting when an expert or specialist IDs an observation of mine, or dis/agrees with my ID. Such a fun way to learn.