How To Make Fertilizer From Kitchen Waste? The Ultimate Guide

Did you know that every year, around 1.3 billion tons of food is wasted worldwide? That’s a shocking amount, considering that many people around the world are still struggling to access enough food to survive. However, there is something we can do with our own kitchen waste to help reduce this problem and benefit our gardens at the same time. By making organic fertilizer from our kitchen waste, we can improve soil quality, reduce the amount of waste we produce, and promote plant growth all at once.

In this article, we’ll explore a step-by-step guide to making your own fertilizer from kitchen waste, so you can start reaping the benefits of this sustainable and cost-effective solution.

Understanding Organic Fertilizer

Organic fertilizer is a type of fertilizer made from natural materials such as kitchen waste, compost, animal manure, and plant debris

It is rich in nutrients such as nitrogen, phosphorus, and potassium, which are essential for plant growth. Unlike chemical fertilizers, organic fertilizer does not contain harmful chemicals that can harm the environment and the soil.

Benefits of Organic Fertilizer

Using organic fertilizer has several benefits.

First, it improves soil quality by increasing soil organic matter and microbial activity.This helps to retain soil moisture and improve soil structure, making it more fertile.

Second, organic fertilizer promotes healthy plant growth by providing essential nutrients that chemical fertilizers lack.

Third, it reduces the risk of water pollution by minimizing the amount of chemicals that leach into the soil and groundwater.

Types of Kitchen Waste for Fertilizer

There are many types of kitchen waste that can be used to make organic fertilizer. These include fruit and vegetable scraps, coffee grounds, tea leaves, eggshells, and even shredded paper.

Types of Kitchen Waste for Fertilizer

It is essential to avoid using meat, dairy, and oily foods as they can attract pests and generate a foul odor.

Materials Required for Making Fertilizer

To make fertilizer from kitchen waste, you will need the following materials:

  • A container with a lid
  • Kitchen waste
  • Soil or compost
  • A shovel or garden fork
  • Water

A Step-by-Step Guide to Making Nutrient-Rich Fertilizer from Kitchen Waste

Making fertilizer from kitchen waste is an excellent way to reduce waste and create a natural, nutrient-rich soil amendment for your garden.

Here are the steps to make fertilizer from kitchen waste.

Step 1: Collect Kitchen Waste

Collecting kitchen waste is the first step in making fertilizer from kitchen waste. Select appropriate waste items that can be easily broken down and will not cause an unpleasant odor. Good items to collect include fruit and vegetable scraps, coffee grounds, eggshells, and tea bags.

How To Make Fertilizer From Kitchen Waste?

These items are rich in essential nutrients like nitrogen, phosphorus, and potassium, which are vital for plant growth. Store the waste in a container with a lid to prevent it from attracting pests and controlling any unpleasant odors.

Step 2: Add Water

After collecting kitchen waste in a container with a lid, the next step is to add water until the waste is fully submerged. This will ensure that the waste is fully saturated with water, necessary for the fermentation process to occur.

Water also helps to break down the waste and release nutrients that will be absorbed by the plants. Use clean water to prevent the growth of harmful bacteria or mold.

Step 3: Wait for Fermentation

Once you have collected the kitchen waste and added water, the next step is to wait for fermentation. Fermentation is a natural process that occurs when bacteria and fungi break down organic matter into simpler compounds.

Allow the mixture to sit for several weeks in a warm, dark place to promote fermentation. A temperature range of 20-30°C (68-86°F) is ideal for fermentation. Stirring the mixture occasionally will help to aerate it, which will speed up the fermentation process. Keep the container covered to prevent the smell from spreading.

Step 4: Strain the Mixture

Once the kitchen waste has undergone fermentation, the next step is to strain the mixture to remove any solid materials that are left after the fermentation process. 

Straining the mixture also helps to make the liquid fertilizer more uniform in consistency and easier to apply to plants. Use a clean sieve or cheesecloth to strain the fermented mixture into a container. Ensure the straining equipment is clean and sterile to prevent the growth of harmful bacteria or mold.

Step 5: Dilute the Liquid

After straining the fermented mixture, the next step is to dilute the liquid fertilizer by mixing it with water at a ratio of 1:10 (one part of the liquid fertilizer to ten parts of water). This will make a diluted liquid fertilizer that is suitable for plants. 

Use clean water when diluting the liquid to prevent the growth of harmful bacteria or mold. Store the diluted liquid fertilizer in a clean container until ready to use.

Step 6: Use the Fertilizer

Once you have diluted the liquid fertilizer, the next step is to use it to feed your plants or add it to the soil in your garden. The nutrients in the liquid fertilizer will help to nourish your plants and improve soil quality. 

Best Liquid Lawn Fertilizer Concentrate

Apply the fertilizer to the soil around the base of the plant or sprayed directly on the leaves. Avoid applying the fertilizer to the leaves during hot, sunny weather as it may burn them. You can also add the liquid fertilizer to the soil in your garden to enrich it with essential nutrients that will improve its texture and fertility.

By following these steps, you can turn kitchen waste into a nutrient-rich fertilizer that will help your plants thrive while reducing waste. Making fertilizer from kitchen waste is an excellent way to promote sustainable gardening practices and contribute to a healthier environment.

Tips for Using the Fertilizer Effectively

Here are some tips for using your homemade fertilizer effectively:

  • Use it sparingly: Homemade fertilizer is very rich in nutrients, so it is important to use it sparingly to avoid over-fertilizing your plants.
  • Mix it in well: When applying the fertilizer to your garden beds, be sure to mix it in well to avoid burning your plants.
  • Apply it at the right time: Homemade fertilizer is best applied in the spring, when plants are just starting to grow, or in the fall, when they are getting ready to go dormant for the winter.

Store it properly: If you have excess fertilizer, be sure to store it in an airtight container in a cool, dry place.


Making fertilizer from kitchen waste is a simple and eco-friendly way to nourish your plants and improve soil quality. By collecting kitchen waste such as fruit and vegetable scraps, coffee grounds, eggshells, and tea bags in a container with a lid, adding water, waiting for fermentation, straining the mixture, and diluting the liquid, you can create a nutrient-rich liquid fertilizer that is suitable for both indoor and outdoor plants.
Not only does making fertilizer from kitchen waste help to reduce food waste, but it also helps to create a more sustainable and environmentally friendly garden.


Is it safe to use kitchen waste for making fertilizer?

Yes, it is safe to use kitchen waste for making fertilizer as long as the waste is organic and does not contain any harmful chemicals or contaminants. It is important to avoid using waste that has been treated with pesticides or other chemicals.

How long does the fermentation process take?

The fermentation process can take several weeks, depending on the temperature and conditions. It is recommended to wait at least two to three weeks for the waste material to ferment properly.

What plants can I use the liquid fertilizer on?

The liquid fertilizer can be used on a wide range of plants, both indoor and outdoor. It is especially effective for vegetables, herbs, and flowering plants.

Can I store the liquid fertilizer for later use?

 Yes, you can store the diluted liquid fertilizer in a clean container until you are ready to use it. It is important to store it in a cool, dark place to prevent the growth of harmful bacteria or mold.

How often should I use the liquid fertilizer on my plants?

The frequency of application will depend on the type of plant and the specific fertilizer mixture. As a general guideline, it is recommended to apply the fertilizer once every two weeks during the growing season.

Additional Questions

How can I create homemade fertilizer from kitchen waste?

You can utilize your kitchen scraps like leftover food, fruit and vegetable peels for creating helpful homemade fertilizer. Firstly, collect all these wastes and add them into a compost bin, followed by adding some water. Let this mixture settle for a day. To hasten the process of composting, you can add some sawdust. In my experience as a green thumb gardener, I’ve found that this composting strategy works amazingly well.

Which is the best homemade fertilizer?

According to extensive research and my personal experience, creating a compost pile from kitchen scraps such as eggshells, fruit skins, and used coffee grounds is highly recommended. A compost pile is a great natural fertilizer; in combination with leaves, twigs, and other organic litter found around your property, it can provide a nutrient-rich supplement for your plants. The best part is, it’s free and great for the environment.

Is it possible to convert food waste into fertilizer?

Believe it or not, you can actually convert your kitchen waste into beneficial fertilizer for your plants even without the process of composting. Simple leftovers like peelings, cuttings, and roots can directly be integrated into your garden soil, proving to be a wonderful way to recycle your kitchen scraps while benefiting your green friends.

Which kitchen scraps are a source of phosphorus?

Interestingly, banana peels are rich in phosphorus, which is vital for plant growth. Incorporating these in your compost not only reduces waste but can lead to a healthy, flourishing garden. Apart from phosphorus, banana peels also provide other essential nutrients like magnesium, calcium, and sulfur. This makes them an exceptional fertilizer option for flowering plants, fruit trees, and houseplants. As someone who has a passion for sustainable gardening, I can confidently vouch for the efficacy of banana peels as a natural fertilizer.