Chris, great advice.** For those having trouble with powdery mildew the older varieties seem to suffer more.* They tend to lose their lower leaves, so I plant something in front of mine to hide their bare knees.* take a look here for homemade powdery mildew solutions (pun intended).* ;)
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.