When is the best time to apply weed killer on St. Augustine grass for best results

Hi everyone, I wanted to share some simple advice about the best time to put weed killer on St. Augustine grass, based on what I’ve learned and experienced. If you have this type of grass and are struggling with weeds, timing really matters to get the best results.

First, the best time to apply weed killer is when your St. Augustine grass is actively growing and healthy. This usually means late spring through summer. The grass needs to be growing well so it can recover quickly after the weed killer affects the weeds. If the grass is stressed or not growing much, the weed killer can harm it more.

Second, it’s best to apply weed killer when the weeds are young and small, not when they are fully grown or going to seed. Young weeds absorb the chemicals better, so they die faster and don’t come back as easily.

Also, avoid applying weed killer if it’s very hot (over 85°F or about 29°C) or if rain is expected soon. Too much heat can stress your grass, and rain can wash the chemicals off before they work.

If you are using a selective weed killer (one that kills weeds but not the grass), read the label carefully to make sure it is safe for St. Augustine grass. Some weed killers can damage this type of grass if used at the wrong time or in the wrong amount.

Finally, for best results, mow your lawn a day or two before applying weed killer, but don’t mow right after applying it. Let the chemicals work for a few days before cutting the grass again.

To sum up:

• Apply weed killer in late spring to summer when grass is growing well
• Target young weeds, not old or seeding ones
• Avoid very hot days and rainy weather
• Use a product safe for St. Augustine grass
• Mow before application, not right after

Hope this helps anyone struggling with weeds in their St. Augustine lawn. Feel free to ask if you want more tips!