Could #2 be Solanum rostratum?

#4 makes me think of something in the Chenopodium genus.

First one looks like Horseweed, Conyza canadensis.

Here is a link that might be useful: {{gwi:239671}}

#3, I forget the name, but it is a weed. Rip them out before they set seed.
Remy

Looks like #2 is Solanum Rostratum, which is poisonous from what I read. I'll be ripping that one out for sure.

Still don't know exactly what the other three are. Thanks for the input folks.

Compare to your first picture.

Here is a link that might be useful: Horseweed

Thank you carol23, it looks like number one is horseweed. Horseweed is said to be good for diarrhea, dysentery and hemorrhoids. Since I have none of these afflictions, I'll be pulling it.

I still don't know the identity of plants 3 and 4. Remy has recommended I remove plant 3, but I kind of like how it looks.

Mytime has said that plant 4 resembles something from the Chenopodium genus. I was thinking it looks like Epazote, an herb from that genus.

-Thanks, Matt

I think #3 looks like a tomatillo plant.

Thanks Everyone. Plant 3 is a tomatillo and plant 4 is Epazote as verified by my Mexican neighbor.

-Matt