6 Amazing Mustard Cake Uses in the Garden

Ralph Astley is a retired gardener from Philadelphia who specializes in outdoor plants and trees. With years of hands-on experience, Ralph not only cares for a diverse range of outdoor flora but also shares his extensive knowledge through well-written articles and social media posts. A trusted authority in arboriculture, he's committed to helping the community grow healthier, more robust gardens.
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Do you want an eco-friendly fertilizer for your yard? Take a look at the Mustard Cake Uses in the Garden and use it today!

Mustard Cake Uses in the Garden

These Mustard Cake Uses in the Garden will surely help your plants to have lush and bountiful growth! Employ them today!

Check out some amazing Epsom salt uses for the garden here

What is Mustard Cake?

The mustard cake is a byproduct of commercial mustard oil production. It is widely utilized as a fertilizer for veggies and flowers in the garden as it is rich in nitrogen, protein, potassium, magnesium, phosphorous, sulfur, and other micronutrients.

It is also eco-friendly and will have no harmful impact on your garden.

How to Use Mustard Cake?

Crush the cake into a fine powder and then soak 100-150 grams in 5-6 liters of water for 1-2 days. After that, dilute it with water in the ratio of 1:1 and use it to water the plants once in 3-4 weeks.

Check out some surprising tobacco uses in the garden here

Mustard Cake Uses in the Garden

1. A Powerful Fertilizer

The mustard cake is the powerhouse of essential minerals comprising 4.85 nitrogen, 2% phosphorous, and 1.3% potassium, which improves the soil texture by providing the right nutrient boost to your plants.

Rich in protein, mustard cake fertilizer is excellent for growing vegetable and flowering plants.

How to use: Grind the mustard cake in a mixer and sprinkle one tablespoon of the fertilizer around the plant. Aerate the top layer to let the nutrients sink in quickly.

Find out a super quick banana peel fertilizer here

2. Prevents Premature Bud Drop

Mustard cake fulfills the protein needs of your plants and stops premature buds from dropping off. This results in better fruit and vegetable production.

How to use: Soak 100 gm of mustard cake in 5 liters of water overnight. Pour one cup of the slow-releasing fertilizer on each plant twice a month for the best results.

Pro Tip: Use rice water instead of regular water to speed up the fermentation process.

3. Promotes Lush Foliage

Mustard Cake Uses in the Garden 2

Fermented mustard cake liquid is scientifically proven as an effective foliar spray for shinier, smoother, and greener leaves. Also, the nitrogen content helps the flowers have vibrant colors to brighten your garden.

How to use: Mix 20-30 grams of mustard cake to a liter of water and leave the solution to ferment for 2-3 days. Stir the liquid to dabble up the mixture, then strain it in a spray bottle. Your foliar spray is ready to yield lush and fuller leaves!

4. Results in Bigger Roses


Rose plants need nutrition to grow bigger blossoms, and mustard cake promotes sturdy plant growth by providing the nutrient supply and phosphorous that helps develop a robust root system in rose plants.

How to use: Mix 100 gm mustard in the plant’s growing medium.

Learn about growing big roses here

5. Eliminates Pathogen

Mix mustard oil cake with soil to amend phytonematodes concentration in soil — a plant pathogen that disturbs plants’ root, stem, and flower growth.

According to the National Library of Medicine, mustard oil cake combined with some biocontrol agents controls the Meloidogyne incognita infestation on tomato plants.

How to use: Mix 20-40 grams of mustard oil cake in the growing medium per plant to prevent harmful plant pathogens and promote healthy growth.

6. Give a Boost to Annual Plants

Mustard Cake Uses in the Garden 3

It will also work wonders for seasonal and annual plants like geraniums, vinca, zinnia, impatiens, petunias, and begonias. In fact, you can use it on any plant of your choice if you want better growth, lush foliage, and pretty flowers!

Check out the 10 best fertilizers here

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