Please advies....Should I cut off brown flower heads from phlox after flowering?
You don't say if it's the perennial or annual phlox, but the answer is still yes.If you have the tall perennial type, a little way below the dead flower head you'll see a couple of tiny shoots coming from a leaf/stem joint. Cut to just above there and you'll get some more flowers.I was doing mine earlier. And I done the same to the annual phlox but just roughly cut back the dead bits.
Thanks so much, Pete! I'll do just as you say & didn't know that there were 2 types of phlox until you replied - live & learn, eh?