Plastic worms have probably accounted for more bass than any other artificial lure on the market. They are so effective around all types of cover and in all types of conditions. There are endless ways to rig a worm so don't limit yourself...try it on a drop-shot; wacky style; on a jighead; or on a split shot rig.
Worms are extremely effective when you are fishing a highly pressured lake. There's really no wrong time or place to rig one up. Skip them under or beside docks, work them around brush piles and rocks, or simply drag it behind the boat. These little morsels are a tasty treat for all species of fish.