Worm castings are one of the most effective fertilizers for any type of crop, providing rich organic fertilization full of nutrients. But what is the best worm casting? Learn how to choose the best worm castings in this article, where we explain everything you need to know.
What are worm castings used for?
Worm castings are a natural fertilizer that improves soil health and promotes proper plant development. This type of compost is obtained from earthworm excrement and is rich in essential nutrients such as nitrogen, phosphorus, and potassium, as well as humic and fulvic acids. It’s also ideal for improving soil structure, increasing water retention, and encouraging root growth.
This fertilizer is one of the most commonly used in organic farming because it leaves no toxic residues and allows natural plant development without altering the taste or quality of the fruits. Its ability to activate bacterial and fungal life in the substrate enhances nutrient absorption, resulting in stronger plants that are more resistant to pests and diseases.
How to choose the best worm castings?
- Consider the type of plant you’re growing and its stage. If plants are in the vegetative growth stage, look for castings with high nitrogen content. For flowering plants, choose a product that also contains phosphorus and potassium.
- Check the composition and nutrients of the worm castings with a good balance of nitrogen, phosphorus, potassium, and humic and fulvic acids.
- Castings format: available in liquid, solid, or powder form, each with different uses.
- Always observe the origin and quality of the worm castings. Prefer products made from worms fed with controlled organic matter.
- Some products include beneficial bacteria and fungi that improve soil health.
- Always follow the manufacturer’s specific recommendations.
Which is the best worm castings?
There is a wide variety of high-quality worm castings on the market. Here is a list that outlines the characteristics of each one to help you choose the best:
Worm castings
Worm castings are a solid fertilizer that provides healthy, vigorous plant growth, reflected in green leaves and strong stems. This concentrated worm manure contains macro and micronutrients, humic and fulvic acids, and beneficial bacterial life. It’s especially useful during the growth phase and the pre-flowering stage when plants need nitrogen to strengthen their roots.
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Worm castings are ideal during plant growth and stretching stages, providing an excellent base for root formation and strong development. They are suitable for a wide range of crops, from vegetables to ornamental plants. Additionally, they can be used in substrate recycling, improving soil quality and creating an ideal environment for plants.
Worm Delight Atami
Worm Delight Atami is a natural fertilizer made from worm manure, known for its high nitrogen, phosphorus, and potassium content. This product promotes lush plant development, improving stem size and health. It also includes beneficial fungi and bacteria that enhance nutrient absorption and plant resistance to disease.
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It is recommended to mix 25% Worm Delight with 75% substrate to improve soil aeration and encourage root development.
Humushemp by Trabe
Humushemp by Trabe is a natural fertilizer that improves root health and promotes growth in plants grown in coco or soil. It’s rich in humic and fulvic acids and helps activate soil microbial life, which contributes to greater nutrient absorption.
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To use Humushemp by Trabe, add 10 to 15 ml per liter of water. This fertilizer is ideal for plants grown in non-aquatic soil.
Top Worm by Top Crop
This organic fertilizer based on worm castings is primarily used during the cannabis growth stage. Top Worm by Top Crop provides nitrogen, improving substrate aeration and promoting microbial flora, essential for soil health. This hummus is eco-friendly and does not affect the flavor or smell of the fruit.
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Mix between 5% and 15% of Top Worm with the substrate. For pots, the recommended dose is 0.5 to 1.5 L per 10 L of substrate.
Mega Worm by Plagron
Mega Worm by Plagron is a powdered fertilizer that helps prepare the soil for root development and flowering. This worm hummus product activates microbial life in the substrate, improving soil quality and nutrient absorption. It is ideal for soil-based crops and is not suitable for automatic irrigation systems due to its slow nutrient release.
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For pots, mix between 5% and 15% of the product with the substrate. For outdoor crops, apply 1 liter per 4 m² of soil.
Comparison of worm castings
| Product | Composition | Recommended use | Main properties |
| Worm castings | Worm excrement | Growth and pre-flowering | Promotes root growth, improves soil |
| Worm Delight Atami | Worm manure | Growth and flowering | High nitrogen, phosphorus, potassium content; beneficial bacteria |
| Humushemp by Trabe | Liquid worm excrement | Root improvement | Root stimulator, activates microbial life |
| Top Worm by Top Crop | Cow, goat, horse worm castings | Cannabis growth | Improves soil health, regulates pH, doesn’t alter flavor or smell |
| Mega Worm by Plagron | Powdered worm excrement | Rooting and flowering | Activates microbial life, improves soil structure |
Each product has its own specific advantages, and choosing the best worm castings depends on the needs of your crop. Choose the one that best fits your plant type and start enjoying healthy, chemical-free growth!



