Freehand 1.75g Herbicide 50 Lbs Preemergence Controls Grasses Broadleaf Sedges Not For Sale To: CALIFORNIA. FreeHandĀ® 1.75G herbicide introduces a new active ingredient for use in landscape ornamentals - dimethenamid-P - combined with pendimethalin. This unique combination makes FreeHand 1.75G the perfect tool for preemergent weed control of annual grasses, susceptible sedge species and many small-seeded broadleaf weeds.