most hardware stores sell these mole 'thingies' ... they look like a fat firecracker ... all they are, is a sulphur stick, similar to a road flare ... (the sulfur won't hurt the roots, in my experience with them) ... you just light it, stick it in a hole, and cover any other holes you find ... you will see smoke coming out of the ones you didn't find ... they work fairly well ... I also tried the exhaust from a motorcycle, dryer vent hose from the muffler, didn't work as well ... :smokin: