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