- 1). Buy Roundup Weed and Grass Killer in the pump-up sprayer. This portable plastic spray rig is easy to carry around your yard.
- 2). Put on protective gloves. Trim away the plastic straps that hold the handle and wand in place.
- 3). Unwrap the hose and connect the end to the pump spout. Push the hose end until it locks in position.
- 4). Remove the sprayer wand from the bottle. Press the yellow button and at the same time pull the nozzle tip out. Stretch out the wand until the yellow button reads "SPRAY."
- 5). Check the connections to verify the handle, hose and pump are connected snugly. Pump the handle up and down about 20 times. This creates pressure in the bottle.
- 6). Point the wand at the thistle and push the white trigger using your thumb. Spray the thistle until it is saturated. The thistles should wither and die within 24 hours.