Should I water in fertilizer after applying?

Granular fertilizer needs about 0.25 inch of water within a day or two to move it off the blades and into the soil. If no rain is forecast, irrigate it in.

How long should weed killer stay dry?

Most foliar weed killers need a rain-free window of at least 24 hours after spraying so the herbicide can absorb before it's washed off.

When's the best day to apply?

Enter your ZIP and what you're putting down. We read your local hourly forecast and rank the next few days by whether the weather waters it in, or keeps it dry.

Why the forecast, not the calendar

Most lawn products need rain (or need to stay dry) within a day or two of going down. A granular fertilizer wants ~0.25" to water it in; a foliar weed killer needs a dry window so it isn't washed off. We read the hourly forecast for your ZIP and rank the next five days against the rule for the product you pick. Always follow your product label.