Just moved to a new place, and these weeds started growing all over. I'm wanting to identify it so I can figure out the best way to get rid of it. They seem to grow only on dry rocky ground, so maybe I just need to patch up the yard with sod? They grow really tall, I've seen one grow 4ft tall in a couple weeks. The stem can get to about half an inch in diameter, and it has a fuzzy texture. The leaves are teardrop-shaped. Here's a photo after I pulled it out (i'm holding it upside-down):



Thanks!

looks and sounds like a sunflower to me

ohh, I didn't know what the stem of a sunflower looked like, thanks!

Can you upload photos showing the top side of the leaves? It does resemble Sunflower (Helianthus)

My first thought was sunflower