It's best to spray at the right time of year and when there's leaves on the plants since it's absorbed that way.

If the driveway is so long you can't water it effectively, and rain isn't often (or it rains in torrents and washes it all away), Preen may not be a good choice.I use a blue dye so I can see where I have sprayed and have calibrated it based on speed so I know how strong to make the mix. It can also be used across patios, walkways, driveways, gravel or mulch beds, and along fences or around buildings.

Although this product is non-absorbing it will provide a strong bond to the layers of paint applied with just enough tooth so as not to be greasy in feel. Applying in calm weather when rain is not predicted for 24 hours will also help to ensure that wind or rain does not blow or wash pesticide off the treatment area.contains 5% or more but less than 15% of non-ionic and anionic surface agents, less than 5% of phosphonates, also contains perfume.