Not as specific, but would !gardening@thegarden.land do? Or is that one of the subs you've looked at?

Whats stopping you making the community yourself?

This is something my wife always complains about, so much so that I've gotten a kagi account and set up a specific search category for gardening that bans certain sites and excludes hits where words contain American spelling. One thing that might be interesting is a list of translated gardening resources from other nearby countries. I'm sure the flora and fauna in the rest of North-West Europe can't be that different?

Here's an example: I translated the phrase "my hawthorn will not bloom" into French and searched for the resulting phrase. Found a website and translated it back to English: https://www-jardiner--malin-fr.translate.goog/fiche/aubepine.html/amp?_x_tr_sl=fr&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp