For a natural way to get rid of a leatherjacket infestation in your garden Nemasys Leatherjacket Killer is the product for you as you do not have to worry about the precautions associated with chemical use. It is safe to use & will not harm children or pets. It’s best to add the natural nematodes to the soil from early September through to the end of October. Do this by watering them into a moist lawn & then watering after the application to make sure they reach the roots for lush green grass in your garden.