I have several plants or weeds that annually spread through my perennial garden. Can someone please help me to identify them?
Thanks!

Here are pictures of the plants (sorry I didn't attach them to the question)!

The first one is very pretty.
2nd looks like corn or sunflower, I get it growing all the time by the bird feeders, can't kill it because the dogs like to eat it. Do you have a bird feeder?
3rd. I get all the time, I'm in N. Cal. Don't know what it is, but happy it comes out really easy.

Sorry, probably not much help:)