#8 sure looks like an Oenothera, but the bloom time is too early for O. biennis. Bloom time is right for O. fruticosa, but the serrated leaf edges don’t jibe with the O. fruticosa I know.
The Philadelphus, aka Mock Orange, should be fragrant. In any case, the poor thing is being overshadowed by its neighbors.
The thistle looks more like a weedy thistle (don’t get me wrong, I love thistles), and not cardoon. Cardoon has more massive, grayish leaves.
I have a soft spot for Pokeweed, Phytolacca americana, too. They fall under the weed umbrella, but, look fantastic in fall, with drooping purple fall berries that birds adore. That’s probably who planted yours, as well.