Fertilize Grass With Coffee Grounds? Lawn Care Secret That Actually Works – Here's How to Do It

If you normally toss your morning coffee grounds in the garbage, wouldn’t it be nice if you could reuse them instead? They make a good “green” component for compost, but they have another use that’s easier and simpler: applying to your lawn.

Coffee grounds lawn care is a little more complicated than simply scattering grounds over the grass, but not much. A little effort can help convert your cup o' joe scraps into effective organic fertilizer.

Many gardeners know to use coffee grounds for plants, but few think of the benefits for grass. Here’s everything you need to know about why, when, and how to use coffee grounds for grass and lawns.

Are Coffee Grounds Good for Lawns?

First, it’s important to understand why you might add coffee grounds to your turf. Is it simply a way to get rid of this organic waste, or is it actually good for the grass? Yes, coffee grounds can be good for your lawn:

• Nitrogen. Coffee grounds make a good green element in compost because they are rich in nitrogen. Nitrogen is one of the three macronutrients that plants need to grow. Nitrogen promotes leafy growth, which means it is especially essential for healthy grass growth.
• Additional Nutrients. Coffee supplies more than just nitrogen. The grounds also have phosphorus and potassium, the other two macronutrients plants need. Additionally, the grounds have trace amounts of micronutrients that will benefit your grass.
• Slow-Release Fertilizer. You can always use a commercial fertilizer on your lawn, but coffee grounds are more natural and release nutrients more slowly. Most commercial products provide a quick dump of nutrients, while coffee grounds break down and release them more slowly, providing sustained nutrition over time.
• Support Earthworms. Earthworms are essential to healthy, rich soil. They break down organic material, making nutrients more available to plants and aerating the soil. Earthworms love coffee grounds and will go to work right away, breaking them down in your lawn’s soil.
• Support Microbes. Coffee grounds on your lawn will also support beneficial microbes in the soil. While some microbes are harmful or cause disease, many are necessary components of healthy soil. Your grounds feed these beneficial microbes, which in turn help create good soil structure and drainage.
• Control Pests. Finally, one proven benefit of coffee grounds in soil is slug and snail deterrence. They can be killed by caffeine poisoning, but will also avoid areas with coffee grounds and caffeine. Grounds can be an important strategy in reducing slug and snail damage to grass and other plants.

How to Apply Coffee Grounds to Your Lawn

You can use coffee grounds on your lawn at any time during the growing season, typically from spring through fall. Spring and summer are the best times, as this is when the grass is actively growing. You don’t need to save up buckets of grounds. Scatter them daily or weekly to start feeding your lawn, improving soil, and managing pests. If you have areas with problematic snails or slugs, start there.

Let the used coffee grounds cool and dry off a little before using them. Sprinkle them over the lawn, aiming to apply about a cup per square yard of turf. Water the area gently after dispersing the grounds. This will help them settle into the thatch and actually get down to the soil. You can use a colander or a spreader, like this Chapin 8706G Spreader from Amazon, to broadcast the grounds evenly.

Take time to spread the grounds evenly rather than dropping clumps on the lawn. Alternatively, you can dump the grounds in several piles and then use a rake to spread them out over the desired area of cover. Something like this Corona GT 3050 Extendable Handle Rake from Amazon works effectively without damaging the grass.

Another way to use coffee grounds to boost the health of your lawn is to add them to a home compost pile. High-quality compost needs a mix of brown (carbon-rich) and green (nitrogen-rich) materials. Coffee grounds can be part of your green components. Mix them into the compost pile, and when finished, apply the compost to the lawn as a top dressing.

Mistakes to Avoid When Using Coffee Grounds on Lawn

Coffee grounds are not a miracle fix or fertilizer, but they can be a useful addition to lawn care if you do it right and avoid common mistakes. The typical mistake many gardeners make is overdoing it. A thick layer, or piles of coffee grounds on grass can smother it and prevent water from getting to the roots.

Layering grounds too thickly is especially problematic if the grounds are still very wet. They don’t need to be totally dry, but the drier they are, the easier they are to disperse and spread.

Another potential mistake is assuming that coffee replaces fertilizer. Coffee improves soil and adds some nutrients, but not enough to completely feed your grass. It may lessen the amount of fertilizer you need, but it should not be a replacement.

Only use spent coffee grounds for your lawn. Fresh grounds that have not yet been boiled are too acidic. Some of that acidity drops as the coffee is brewed.

Coffee grounds are useful in the garden in more ways than one. If you like how they improve your lawn soil, consider adding them to garden beds as well. Keep the same tips in mind and avoid overdoing it. A little goes a long way.