To spray individual weeds without catching your favorite plants in the crossfire:
- Cut the bottom off of a plastic 2-liter soda bottle.
- Set the bottle over the weed.
- Put the sprayer nozzle in the mouth of the soda bottle and spray.
- Let the chemicals soak in for a few seconds before lifting the bottle.
For larger problem areas consider using a cardboard box. Just be careful not to brush the cardboard up against your plants when removing it.