sustainable and cost-effective way to provide essential nutrients to your plants. Mustard cake, a byproduct of mustard oil production, is rich in nitrogen and other nutrients, while eggshells contain calcium and other minerals beneficial for plant growth. This guide will provide you with easy-to-follow steps for making and using mustard cake and eggshell fertilizer for any plants in your garden.

Materials You Will Need

  • Mustard cake (powdered or in solid form)
  • Eggshells (cleaned and crushed)
  • Water
  • Large container or bucket
  • Stirring stick or spoon
  • Strainer or cloth (optional)

Step-by-Step Guide to Making and Using Mustard Cake and Eggshell Fertilizer

Step 1: Prepare Mustard Cake and Eggshells

  1. Crush Eggshells: Collect clean eggshells and crush them into small pieces using a mortar and pestle or by rolling them with a rolling pin. Ensure that the eggshells are finely crushed to facilitate decomposition.
  2. Grind Mustard Cake (Optional): If using solid mustard cake, grind it into a fine powder using a blender or grinder. This will help in the decomposition process.

Step 2: Mixing Ingredients

  1. Combine Mustard Cake and Eggshells: In a large container or bucket, mix the powdered mustard cake and crushed eggshells in equal proportions. The ratio can vary depending on the nutrient requirements of your plants.
  2. Add Water: Gradually add water to the mixture while stirring continuously until it forms a thick, slurry-like consistency. Ensure that all the ingredients are well-incorporated.

Step 3: Fermentation Process

  1. Cover and Let Ferment: Cover the container or bucket with a lid or cloth to prevent insects and debris from entering. Place it in a warm and shaded area for fermentation to occur.
  2. Stir Occasionally: Stir the mixture occasionally to facilitate the fermentation process and ensure uniform decomposition of the ingredients.

Step 4: Straining (Optional)

  1. Strain the Mixture: After a few weeks of fermentation, strain the mixture through a strainer or cloth to remove any large particles or solids. This step is optional, but it can help in obtaining a smoother fertilizer solution.

Step 5: Dilution and Application

  1. Dilute with Water: Dilute the fermented mustard cake and eggshell fertilizer with water in a ratio of 1:5 or as desired, depending on the concentration and the needs of your plants.
  2. Apply to Plants: Use the diluted fertilizer to water your plants or apply it directly to the soil around the base of the plants. Ensure thorough coverage of the root zone.

Step 6: Continued Application

  1. Regular Application: Apply the homemade fertilizer to your plants once every 2-4 weeks during the growing season to provide them with a continuous supply of nutrients.
  2. Monitor Plant Growth: Monitor the growth and health of your plants regularly to assess the effectiveness of the fertilizer. Adjust the frequency and concentration of application as needed.


Making and using mustard cake and eggshell fertilizer for any plants is a simple and eco-friendly way to nourish your garden with essential nutrients. By following these easy steps and providing your plants with this homemade organic fertilizer, you can promote healthy growth and yield bountiful harvests. Experiment with different ratios and application methods to find what works best for your plants. Happy gardening!