Roundup weed killer is a well respected, safe herbicide commonly used for the control of all types of weeds and undesirable grasses. When used properly it can be very beneficial to controlling weeds on your lawn, but there are a few things everyone should know when it comes to reseeding the area where Roundup has been applied.
The Basics of Using Roundup
When using any herbicide, always read and follow all directions carefully.
Roundup is made in several different formulas that target the weeds or grasses that you wish to get rid of. Make sure you get the right type.
When you spray Roundup on the plants you want to get rid of, it's absorbed through the leafy structures. Once it hits the ground, it starts to become inert, and it's effectiveness wears off rapidly. There are almost no lasting side effects once it comes into contact with soil.
Time to Reseed
Since Roundup becomes inactive shortly after it comes into contact with the soil, it's safe to reseed grass 24 hours later. However, here are a few things to consider.
Waiting three to seven days might be better because if there are a few weeds still around, they will still be there days later, which means you may want to spray them again. If you have reseeded quickly and your new grass is coming up but weedsl remain, you'll have to reseed again.
If this is a garden area, remember that certain vegetables need to be reseeded at different times. Most vegetables can be reseeded after 24 hours but some such as corn, cucumber or eggplant should not be seeded for three days.Tomato transplants need to be held off for 30 days after using Roundup.
Instead of reseeding grass, consider using sod instead. It's virtually an instant lawn that can be laid down and watered heavily for the first few days, which will give very good results.
Follow all warnings on the label.
Always wear gloves, safety glasses/goggles and long pants when spraying.
Seed grasses according to spreading directions, whether you broadcast the seed by hand or with a seeding machine.
Since Roundup works so well, even a bit of overspray caused by a slight breeze can kill or severely damage plants that are in the way. By using a piece of cardboard as a shield when spraying, you will limit any wind-borne overspray and make sure that plants you do want to kill will remain safe.
Small hand sprayers work well for limited spraying, and can also target areas precisely. Tank sprayers and hose attachment sprayers will cover much larger areas quicker, but remember tank and hose sprayers are not as precise as hand sprayers, so watch out for overspray.