The best time to apply a broadleaf weed killer in the lawn is September and October. This is the time of year dandelion, plantain, and other weeds are storing up energy in their roots for winter.

Preen Lawn Weed Control kills more than 200 kinds of lawn weeds down to the root, including dandelion, chickweed, clover, knotweed, plantain, henbit, spurge, thistle and many others commonly found in home lawns.

Here are some tips for the best control of these weeds:

• Mow the grass to normal height one to two days before applying Preen Lawn Weed Control.
• Water the lawn deeply about one day before application to sustain moisture until the next watering.
• Apply when the lawn is wet with morning dew or lightly moisten the grass so the product granules cling to the plants.
• Delay watering the lawn for two days after application to make sure Preen Lawn Weed Control has a chance to work. Keep traffic off the treated area for 24 to 48 hours after application, until the lawn is watered.
• Do not apply to newly sown lawns or turf seedlings until the grass has been mowed at least three times.
• If you have only a few weeds, consider spot treatment.
• Always read and follow the label directions.