I'm in western Washington and have a suburban plot that has been well disturbed in it's history. Aside of the, there are buttercups almost everywhere (except further back in undisturbed forest), and they are constantly angling at my gardens. Several areas of former lawn that I am converting into gardens without tilling are significantly infested. Or, to use a word loaded in a different direction, significantly endowed.
If you haven't dealt with buttercups before, they grow to about a foot or two tall, send out 20 foot runners in all directions, inhibit nitrogen fixers in the soil, and smother everything around them for light. They can grow in the shade where little else does, and from their launch their attacks benevolence on the surrounding areas.
It would be easy to plastic-mulch them out of existence, but in the process I'd kill the wonderfully thick layer of moss that serves as a living mulch, and all the other life that is heading in the right direction. I want to understand how these can serve a useful function in a process of restoration of this sad land. As has been discussed before (on a podcast, at least), plants regarded as invasive are often helpful pioneers in the process of restoration, by growing and providing a foothold of organic matter and fertility before other plants would be able to.
The thing that puzzles me here is their anti-nitrogen impact, and the fact that buttercups won't ever want to give up no matter what the soil does, and it feels like I'll have to wage mighty war in the future if I let them get any more established than they are now. I'd love any insights!
J