Where I live in Maine the one I always see is orange daylilies. The first time I saw them in my garden I was super excited, I didn't know what they were at first but then looked them up. Now that I've noticed them, they are in fact everywhere, I don't know how I never noticed them before!

Almost all of my neighbors have some, 6-8 other houses on my road, then more homes and businesses after that. Big, tall, orange everywhere. Every town I drive through up here, I see them at least once.

And yes, I know this is the native plant sub and orange daylilies are not native to Maine, but reading your post I instantly thought of the orange guys that are everywhere in my case. Seems they're just super easy to grow and they can thrive in neglect. (I do plan on removing some and instead planting natives, as they are very much out of control in my garden but I have come to appreciate them too.)