Broadleaf Weed Control – Lawn Talk Podcast

Lawn Talk with Harold Enger – Podcast Transcription

Episode: Broadleaf Weed Control


Tim Kauffold: Welcome to Lawn Talk, I’m your host Tim Kauffold. Lawn Talk is a series of conversations with Spring-Green lawn care professionals. Joining me is Harold Enger. Harold has worked in the Green Industry for nearly 30 years and is a Certified Turfgrass and Ornamental Landscape professional. Broadleaf weed control is the topic of this week’s Lawn Talk. Harold, why is it that I keep getting weeds after my lawn has been sprayed with a weed control?

Harold Enger: Well, you have to understand that a lawn is a dynamic identity. There are always things happening. You have weeds that will germinate throughout the year, because you have summer germinating weeds, you have spring germinating weeds and you have fall germinating weeds, so you are going to have weeds that will grow throughout the entire year. We control that. We put down a growth hormone and what it basically does is that it causes the plant to grow itself to death. Well, the plant has to be up and growing for it to absorb that material to get good control onto the weed. If we spray on let’s say the first week of April, well maybe the first week of May there are other weeds that are beginning to germinate and so you have to come back out and put down another product to get those weeds that will germinate at a different point. The best thing to think of is it’s dynamic. It’s always happening. It’s a living ecosystem.

Tim: So it sounds like there isn’t really an ideal time to spray, but instead we want to make sure we’ve got a program in place for the lawn to cover all these different varieties.

Harold: Right and that is true, but there are two times of year that we want to make sure we really get a good weed control application and that is for your spring and fall germinating weeds—what we call your summer annuals and your winter annuals. Your summer annuals are the plants that will germinate in the spring. They will grow, produce a flower, produce a seed and then die in the cool weather of the fall. Where the other ones, the fall or winter weeds will germinate in the fall, over winter be in the green vegetative state,  in the spring they will produce the flower seed and, then, they will die in the heat of the summer. So, the spring application, and fall application are your most important times.

Tim: And as a homeowner, after I’ve had a treatment applied, how long do I need to wait before I can get out and mow my lawn?

Harold: Well, for the most part, you can mow the same day as you put down a weed control, because  the weeds are going to be low to ground. They aren’t going to be up higher than the grass. So you could mow after two or three hours.  Generally they say to wait 24 hours, but if it’s your day to mow, or you’ve got your mowing service coming out that day, as long as that weed control material has had a chance to dry it will be okay.

Tim: And along those lines, do I need to wait before I water the lawn again?

Harold: Again you want to wait until the material is dry and that depends on the weather conditions. Sometimes with a liquid weed control it takes ten minutes for the material to dry on the plant and sometimes it can take 2-3 hours if it’s a cool cloudy day. But for the most part, we would like you to wait at least two hours before doing any watering.

Tim: Now that I’ve had the treatment put on and I haven’t washed it away. How long before the weeds start to disappear?

Harold:  Generally you should start to see some activity within about 24 to 48 hours and what you are going to see is the weed beginning to twist or curl in on itself.  Remember, I said weed control is a growth hormone. It basically grows the top faster than the bottom, the roots can’t keep up with the growth and it grows itself to death. Now this rapid explosion often happens quickly—24 to 48 hours—but we do ask that in some situations it can take up to two weeks before you actually see any activity. Some weeds don’t do the twisting and curling—some turn yellow, others just fade away.

Tim: If you would like to know more about services available from your local Spring-Green lawn care professional, visit the Spring-Green web site, at  There you will find more detailed information, including how to contact a Spring-Green lawn care professional in your area. This has been Lawn Talk, an on-going series for homeowners looking to protect and enjoy their outdoor investment, brought to you by Spring-Green Lawn Care and its many local lawn care professionals nationwide.
Find more episodes at or on iTunes under Lawn Talk. Thanks and have a green day!

For further reading, visit our lawn fertilization and weed control page.