How to Use Coffee Grounds in the Garden
 

Most vegetables tend to grow better in soil that falls near a neutral or near-neutral soil pH.  Some of your most favorite vegetables and herbs will adapt when growing in acidic soil, however there are some that actually prefer slightly acidic soil.

If you want to amend your soil and slightly improve the acidity for these varieties to thrive, try mixing in a small amount of fresh, (un-used) coffee grounds into the soil around these "acid-loving" plants. (Tomatoes, Marigolds, Dill, Endive,  Spinach, Parsnips, Garlic, Parsley, Rutabagas, Turnips, Peppers (HOT) & (Sweet), Carrots, Cauliflower, Cucumbers, and Squash.)

Once you determine whether you want to apply "a little" or "a lot" of acidity via your coffee grounds you're ready to start using this readily available fertilizer in your garden. 

TIP:  Scroll down to the bottom of this post to read even more ways you can coffee grounds in your garden. For example, you can make a "tea" out of the used grounds to use as a spray to repel insects and caterpillars - naturally!

Most people would assume that used coffee grounds are very acidic, but tests on the pH of this natural fertilizer shows that they are only mildly acidic. These used grounds therefore make a good "side-dressing" to many plants because as they decompose they tend to return to a near neutral pH. This means your plants get an added boost of nutrients right away, and then they will slow down over time making your plants ready to be re-fertilized.  

Now fresh, un-brewed coffee grounds are more acidic than their brewed version. Because of this, they can be used slightly different in your garden. If you're growing things that don't mind the extra boost of acidity, then apply new grounds.

⚠️ IMPORTANT: Don’t use coffee grounds that have fermented or rotted. Use fresh organic grounds. Drip grounds tend to work better than boiled grounds, as they are higher in nitrogen content. You can also sprinkle some of the used grounds around flowers and vegetables before watering them for a slow-release of nitrogen. Try buying compostable non bleached coffee filters, as this makes it easy to just throw both grinds and filters into your compost box.

 

More ways .... to use coffee grounds in your garden:

TIP #1 - Mix 1/2 pound of coffee grounds with 5 gallons of water to make for an instant liquid fertilizer for your grass or lawn.  For a quick fertilizing spray, dilute the grounds in purified water and spray directly on plants. Experts recommend using a half-pound of wet grounds to five-gallons of water. You can also directly sprinkle grounds into houseplant soil or in your outdoor vegetable boxes

TIP #2 -
Use small amounts to help suppress fungal rot or wilt, such as Fusarium, Pythium, and Sclerotinia species.
 
TIP #3 - Make a "tea" out of the used grounds to use as a spray to repel insects and caterpillars.  

TIP #4 - Spread around the base of your azaleas, hydrangeas, roses and lilies.

TIP #5 - Use grounds to suppress weeds in your garden. 

To use your coffee grounds as sheet mulch, simply dump them around the base of your plants and rake them out to a fine layer. If you get the layer too thick, you can count on it getting moldy.   

TIP #6 - Grounds can also work well as a natural deterrent for animals such as cats and rabbits. 

TIP #7 - Use as a Slug deterrent. If slugs are getting the best of your tender young leaves inside of your vegetable garden, try placing some used coffee grounds as a barrier on top of the soil around your plants. The rough grounds will scratch their little bodies making it uncomfortable for them to find their way onto your young and fragile new plants.

Tip #8 - Great for worm bins and composting!  Try letting your grounds sit for about 3 days before adding them into your worm bins or compost. The high nitrogen content in coffee grounds make for good worm food, but try to not overdo it. Limit the amount of grounds you add for a successful compost, especially when worms are involved.

 

Leave a comment

All comments are moderated before being published

FEATURED POSTS

VIEW ALL BLOG POSTS
The SECRET to getting more tomatoes on every plant

The SECRET to getting more tomatoes on every plant

Maybe it's time to give your tomatoes a little bit extra "care and encouragement", in the form of spanking them. Now, we're not endorsing plant abuse here by any means, but what we are suggesting is making sure that all of those tiny flowers get the proper pollination they need to produce fruit. 
How to Grow a Giant Pumpkin from Seed

How to Grow a Giant Pumpkin from Seed

If you’re planning on growing a GIANT pumpkin, keep in mind that you may need anywhere from 400 sq. ft. all the way up to 1200 sq. feet for just ON...
38 Edible Flowers To Plant In Your Garden

38 Edible Flowers To Plant In Your Garden

Nothing will impress your friends and family like sprinkling some colorful flowers into a salad, onto pastries or even as a garnish in their favorite drinks. Edible flowers will add a beautiful splash of color to many dishes and they are readily available, when you're growing them right in your own garden.
15 Herbs You Can Grow at Home To Make Your Own Tea

15 Herbs You Can Grow at Home To Make Your Own Tea

These 15 herbs will make a wonderful addition to your collection of "tea making supplies"!  Start curing your ailments naturally by growing your own herbal remedies. You can use them individually or mix and match to create unique tones and flavors that are suitable to your own liking. 
Your Guide to Gardening Through all 4 Seasons

Your Guide to Gardening Through all 4 Seasons

As the weather becomes consistently cold (in late October and early November, in the upper Midwest), you can work at preparing your garden for winter. There are several aspects to winter preparation.
How to Deal with Squash Bugs

How to Deal with Squash Bugs

Squash bugs can destroy crops and are quite the nuisance. Check your squash plants daily for signs of squash bugs and their eggs.   What to look...
How to Save 🍅 Tomato Seeds

How to Save 🍅 Tomato Seeds

There are several ways that you can save your heirloom tomato seeds, but here are two of the most popular techniques.  Fermentation Method: Choos...
How To Tell When 🍆 Eggplant Is Ripe

How To Tell When 🍆 Eggplant Is Ripe

One of the easiest ways to determine if they are ripe is to gently squeeze the eggplant. Once you release, the skins should "bounce back". If indentations remain, the fruit is not quite ripe yet. 
Prepare NOW for a garden in the fall!

Prepare NOW for a garden in the fall!

Summer will soon be over but having a thriving vegetable garden doesn't have to end when summer does. With a little bit of planning, and p...

SHOP OUR ENTIRE SEED CATALOG

Browse through hundreds of different varieties

📙 SEED CATALOG {A - Z}
ABCDEFGHIJKLMNOPQRSTUVWXYZ

ENTER THE SEED SHOP ❱

YOU RECENTLY VIEWED