You know what’s even more important than timing? Moisture. Weed and feed works best when the grass is a little damp—like from morning dew—so the granules stick to the weed leaves. If your lawn is bone-dry, those granules just bounce off like popcorn on a hot skillet. So check the forecast: apply when dew is expected, or lightly water your lawn first. And for the love of green grass, don’t apply right before a heavy downpour. That’s just flushing your money down the drain.
Also, mowing on a wet lawn is a messy nightmare, so don’t mow wet grass. But you already knew that, right?
Spray Weeds Before Or After Mowing | Keep Bugs Away
One more thing: “feed” vs. “weed”—they have different moods
Here’s where it gets interesting. The “feed” part of weed and feed actually wants to get into the soil to feed the roots. So if you apply it to super long grass, half of it gets stuck on the blades and never reaches the dirt. That’s like throwing pizza toppings at a ceiling fan—most of it ends up in the wrong place. Mowing first gives the feed a clear path to the ground.
But the “weed” part wants to stay on the weed leaves. So if you mow after applying, you’re cutting off the leaves that just got dosed. The weed might laugh and grow back. So mowing before is the only way to keep both parts happy.
