Table of Contents
Introduction
Every coffee lover knows that coffee grounds are used for making their beloved coffee beverage and after using them, people throw them into the garbage, thinking about them as trash. But in actuality, used coffee grounds have some surprising secrets and are still more worth it after being used.
It is a rich source of organic matter and nutrients and can be reused as an organic fertilizer. People are using it on their backyard gardens, plots and indoor plants after acknowledging that coffee grounds are an excellent compost booster and a mild pest deterrent.
But the first query that usually arises in every person’s mind is how to use coffee grounds in the garden. If this question is circulating in your mind too then you don’t have to worry about it. In this article, we are going to explore all necessary information and methods of how to use coffee grounds in the garden…
What are coffee grounds
Let’s start understanding our query about how to use coffee grounds in the garden from the basics of what coffee grounds actually are. Basically, coffee grounds are a finely crushed form of coffee beans usually used in coffee brewing.
While used coffee grounds have other advantages too. People, especially the persons who loved gardening, collect the used coffee grounds from their kitchen or local cafes and reuse them as a soil fertilizer. This is not only cost effective or economical but it also works as an organic source of nutrients that helps in plant growth.
Usually people are confused between normal coffee grounds and used coffee grounds. Which is better?
Let’s explore their differences.
| Fresh coffee grounds | Used coffee grounds |
| Fresh coffee grounds are more acidic and have more caffeine content as compared to used ones, which can damage the plant’s roots and slow down plant growth. | Used coffee grounds are less acidic with less caffeine content and have a lower neutral pH level, ideal for soil mulching and boosting up plant growth. |
Nutrients present in coffee grounds
There are some nutrients present inside the coffee grounds, even after being used. Those nutrients play an important role in the soil fertilization process and can also help in plant growth. The names of those nutrients are as follows
- Nitrogen
- Potassium
- Phosphorus
- Magnesium
- Calcium
Step guide on how to use coffee grounds in the garden
Coffee grounds can be used in the garden in multiple ways. In this section we are going to explore the multiple ways of using coffee grounds. So, the methods are given as follows
Mix into the soil
The first and simplest method of utilizing coffee grounds is to mix them directly with soil. First you have to select ground qty, which should be 10% to 20% of the volume of soil.
Then spread that selected amount of coffee grounds over the soil. By using a rake or trowel, mix the ground with the soil into the top 2 to 4 inches. After that mixing, just water it lightly.
Coffee ground composting
The second method of how to use coffee grounds in the garden is composting. It is one of the most effective ways in which coffee grounds are converted into compost form.
First, you have to select the ratio which is 1:3 of green material w.r.t. brown material. Green compost materials are considered used coffee grounds because they are rich in nutrients, especially nitrogen. Brown compost materials are treated as dry leaves, straw or newspaper.
Now, mix both of them and make a compost pile and leave it for some time period. Over time, coffee grounds will break down and this mixture will convert into nutrient full organic matter which is perfect for soil.
Use as a mulch
The third method of how to use coffee grounds in the garden is to use them as a mulch. Slightly similar to the first method, mulch is a process in which you add the used grounds over the surface of soil as a top layer.
Unlike the mixing process, it is a thin layer of 0.5 or less than 0.5 inches over the soil. This will act as a natural pesticide and help in retaining the soil moisture.
Make liquid coffee ground fertilizer
The fourth method in our list of how to use coffee grounds in the garden is to make a liquid coffee ground fertilizer. First you have to take 2 or 3 cups of coffee grounds and dissolve them into 5 to 6 gallons of water.
Mix it well and let it steep for almost 24 to 48 hours. This will break down the structure of coffee grounds and help to dissolve nitrogen in water and make a nitrogen rich liquid fertilizer.
Now, use them for watering the plant, and try to use them on the roots for better results.
Which plant accepts coffee grounds
After understanding the methods of how to use coffee grounds in the garden, the next most important thing that you must understand is the type of plants that accept and reject the coffee grounds as a fertilizer.
Plant that likes coffee grounds
As we know, used coffee grounds are almost neutral but they still have some traces of acid which are acceptable for acid loving plants. Some common names of that kind of decorative plant and vegetable are given as follows
| Decorative plants | Vegetables |
| Blueberries Azaleas Rhododendrons Roses Camellias Hydrangeas Gardenias | Tomatoes Carrots Radishes Cucumbers Peppers Leafy greens Beans Peas |
Plants that don’t like coffee grounds
The plants that are sustainable in less moisture areas usually don’t accept coffee grounds. These kinds of plants prefer less organic soil or alkaline soil and can suffer if coffee grounds are additionally used over them. The popular names of that type of plant are given as follows
- Lavender
- Rosemary
- Sage
- Thyme
- Succulents
- Cacti
- Orchids
- Asparagus ferns