Blue-eyed grass
Blue-eyed grass (Sisyrinchium angustifolium) started to appear all over the garden after trees were felled to let in more light. I've read it prefers well drained soils but tolerates seasonal wetness well. It's also a good self-seeder.
This plant is in a very wet spot but it's certainly competing well with other plants: several weed grasses, dandelion, of course, Equisetum arvense, clover, seedling asters, probably other things I can't identify here. Since its numbers increase every year, I'm assuming it will be around for a while.
I think the best I can hope for is a kind of balance, a standoff, where I have a slight advantage because I have eyes to see, a brain to discriminate between the winners and the losers, hands to pull. But I won't be around forever. The plants will eventually prevail and do as they want.
James Golden