Originally Posted by DaveCoulier
I never had any problems caused by the gnats. All my plants looked great and were healthy except for one runt, but it was a runt from the moment it cracked the surface of the soil. I didn't have bad gnat problems back then, but it probably didn't help to have to deal with it later in life. I ended up culling it.
If your plants are already in pots, I would either place the dunk in your water source and water as usual, or if you dont have a reservoir, just crush it up and topdress each