Mustard Cake Fertilizer is a natural organic fertilizer made from mustard seed cake after oil extraction. Also known as sarson khali, mustard khali, mustard oil cake, or سرسوں کھلی, it adds slow-release nutrition and organic matter to soil, helping support healthier roots, greener leaves, and steady plant growth.

It is useful for rooftop pots, grow bags, kitchen gardens, vegetables, herbs, flowering plants, fruit plants, and garden beds. In Pakistan, mustard cake is a familiar organic soil booster for home gardeners who want a traditional khaad-style fertilizer for seasonal vegetables, balcony plants, and edible crops.

Unlike quick synthetic fertilizers, mustard cake breaks down gradually in soil. It works best when mixed lightly into the topsoil, used before planting, or soaked to make a diluted liquid feed.

Pack Size Guide

500g: Best for a few pots, trial use, or small balcony plants.
1kg: Suitable for regular use in pots, herbs, flowers, and vegetables.
5kg: Good for grow bags, garden beds, fruit plants, and repeat feeding.
25kg: Best for larger gardens, lawns, raised beds, or bulk soil mixing.

Most home gardeners choose: 1kg or 5kg.

Why Gardeners Prefer It

Organic NPK Source
Provides natural nitrogen, phosphorus, potassium, and organic matter for steady plant growth.

Supports Leafy Growth
Useful for vegetables and herbs that need healthy green growth, such as spinach, dhania, mint, and chillies.

Improves Soil Health
Adds organic content to soil and supports better texture, microbial activity, and long-term fertility.

Good for Roots and Transplants
Helps improve the growing environment around roots when used in moderate amounts.

Supports Root-Zone Protection
Can help make the soil environment less favourable for some common soil pests when used regularly with good soil care.

How to Use Mustard Cake Fertilizer

Top Dressing for Pots and Grow Bags

• Add 1 tablespoon for a 10–12-inch pot.
  
• Mix lightly into the topsoil.
• Water well after application.
• Repeat every 4–6 weeks during active growth.

Soil Preparation Before Planting

• Mix 100–150g per square meter into garden soil or raised beds.
• Blend into the topsoil before sowing or transplanting.
• Water after mixing so it can start breaking down in the soil.

For Fruit Plants and Larger Pots

• Use 250–500g around the root zone, depending on plant size.
• Keep it away from direct contact with the stem or trunk.
• Mix lightly into the soil and water deeply.

Liquid Mustard Feed

• Soak 1 cup mustard cake powder in 4 liters water for 24 hours.
• Stir well and strain before use.
• Dilute further if the smell is strong or plants are young.
• Pour around the plant base every 3–4 weeks.
• Avoid using concentrated liquid feed on seedlings or weak transplants.

Best For

Vegetables and herbs: e.g. spinach, dhania, chillies, mint, okra, and tomatoes.
Flowering plants: e.g. roses, marigold, zinnia, petunia, and seasonal flowers.
Fruit plants: e.g. lemon, guava, papaya, pomegranate, and moringa.
Pots and grow bags: useful for rooftop pots, balcony plants, and kitchen gardens.
Garden beds: helps improve soil organic matter and fertility over time.

FAQs

What plants can I use mustard cake fertilizer on?

You can use it for most vegetables, herbs, flowers, and fruit plants, including tomatoes, chillies, spinach, dhania, okra, roses, marigold, lemon, guava, and papaya.

Does mustard cake fertilizer control pests?

Mustard cake may help support root-zone pest management by improving soil conditions and making the soil less favourable for some pests. For active pest problems, combine it with good drainage, clean soil, and proper plant care.

Can I combine mustard cake with other fertilizers?

Yes, it works well with compost, vermicompost, neem cake, bone meal, seaweed liquid fertilizer, or balanced NPK. Avoid overusing multiple strong fertilizers at the same time.

How often should I use mustard cake fertilizer?

Use every 4–6 weeks for pots and grow bags during active growth. For liquid mustard feed, apply every 3–4 weeks in diluted form.

Does mustard cake smell strong?

It can have a natural mustard or organic smell, especially when soaked in water. The smell usually reduces after mixing into soil and watering well.