19 Examples of Organic Fertilizers

Organic fertilizer

Organic fertilizers are natural substances used to enrich soil and boost plant growth. They come from organic sources like plants, animal waste, or mineral deposits, rather than being chemically manufactured. Organic fertilizers work by slowly releasing nutrients into the soil, which helps plants grow in a sustainable and healthy way. They are not just beneficial for plants they also improve soil health by increasing its organic content and encouraging the growth of beneficial microbes. This makes the soil more fertile and better at retaining water and nutrients. Organic fertilizers are popular in organic farming and gardening because they are environmentally friendly and support the natural ecosystem of the soil. Find some examples of organic fertilizers below:


1. Compost


Compost is a natural booster for plants, created by the breaking down of leftover food and plant parts. It is made from everyday stuff like fruit peels, eggshells, and yard clippings. Over time, these materials turn into a rich mix that’s great for gardens. Compost helps the soil stay moist, makes it easier for plant roots to spread, and feeds the plants with essential nutrients. Using compost is simple: you can mix it into the soil when planting or spread it around plants to keep them healthy and strong.

2. Manure


Manure, a classic and powerful fertilizer, is made from the waste of animals like cows, horses, and chickens. Found mostly on farms, it is a mix of animal droppings and sometimes straws. This natural blend is packed with nutrients that are great for the soil, helping to make it healthier and more fertile. When manure is added to the soil, it slowly releases these nutrients, giving plants what they need to grow over time. It also adds important organic material to the soil, which improves its quality and ability to support plant life. Manure is typically spread over fields or mixed into the soil of garden beds before planting, providing a nutrient-rich foundation for plants to flourish.

3. Bone Meal

Bone Meal

Bone meal, a useful garden additive, comes from grinding up animal bones, usually from slaughterhouses. It is packed with phosphorus and calcium, two nutrients that are especially good for plants that flower and those that need strong roots. This makes it an ideal choice for gardens with flowering plants and bulbs. When you mix bone meal into the soil, it helps plants to develop robust roots and vibrant blooms.

4. Blood Meal

Blood Meal

A blood meal is a potent fertilizer that’s essentially a dark powder made from dried blood, usually obtained from animals processed in slaughterhouses. It is particularly rich in nitrogen, a key nutrient that’s vital for the growth of leafy plants. This high nitrogen content makes it excellent for encouraging overall plant growth, providing a rapid boost of this essential nutrient.

5. Fish Emulsion

Fish Emulsion

Fish emulsion is a type of liquid fertilizer with a strong smell, made from leftovers of the fish industry. It is full of nitrogen and other essential nutrients that plants need. This fertilizer is known for releasing its nutrients quickly, making it great for giving plants a fast boost in growth. When plants get fish emulsion, they absorb the nutrients easily and grow quicker and healthier. To use it, you just dilute it with water and then either pour it onto the soil or spray it on the leaves of the plants.

6. Seaweed Extract

Seaweed Extract

Seaweed extract, a powerful plant tonic, is derived from different types of seaweed. It is packed with trace minerals and natural plant hormones, making it highly beneficial for plant health. This extract is particularly good at boosting a plant’s overall well-being and its ability to handle stress, like harsh weather or pests. It not only encourages plants to grow better but also helps them resist diseases more effectively. Typically, seaweed extract is used as a liquid that you can spray either directly onto the leaves of plants or the soil.

7. Guano


Guano, a highly effective fertilizer, is essentially the droppings of birds and bats. It is known for being particularly rich in nitrogen and phosphorus, two nutrients that are crucial for the growth of plants. This makes guano a potent and fast-acting choice for gardeners looking to give their plants a significant boost, especially those that are flowering or producing fruit. The nutrients in guano are readily available to plants, providing a quick source of nourishment. Due to its strength, it is best to use guano in small amounts, mixing it into the soil. This helps to ensure that plants get benefits without the risk of over-fertilization.

8. Worm Castings

Worm Castings

Worm castings, which are essentially earthworm droppings, are extremely beneficial for plants. These castings are produced naturally as earthworms go about their business in the soil. What makes them special is their rich content of nutrients and beneficial microbes, which are tiny organisms that help plants grow. Worm castings are a boon for both soil health and plant growth. They improve the structure of the soil, making it better for plant roots, and increase the availability of nutrients. To use worm castings, you can simply mix them into the soil or sprinkle them on top of your plants.

9. Alfalfa Meal

Alfalfa Meal

Alfalfa meal is a natural fertilizer made from ground-up alfalfa plants, a type of legume often used as food for animals. This meal is a great source of nitrogen, as well as a variety of other nutrients that plants need to grow. It is especially good for improving the overall fertility of the soil and encouraging healthy plant growth. One of the key benefits of alfalfa meal is that it releases nutrients slowly, providing a steady supply of food to plants over time. This not only helps the plants grow better but also enhances the health of the soil itself. To use alfalfa meal, you can mix it into the soil before planting or use it as a top dressing for existing plants, giving them a nourishing boost.

10. Cottonseed Meal

Cottonseed Meal

Cottonseed meal, a byproduct of the cotton manufacturing process, serves as an effective fertilizer. It comes from the remnants of cotton seeds after they’ve been processed. This meal is particularly rich in three key nutrients for plants: nitrogen, phosphorus, and potassium. These elements make it a well-balanced fertilizer, providing essential nutrients that plants need to grow. One of its notable features is the slow release of these nutrients, which ensures a steady supply over time, aiding in consistent plant growth. Additionally, cottonseed meal slightly lowers the soil’s pH, making it an excellent choice for plants that prefer more acidic conditions.

11. Rock Phosphate

Rock Phosphate

Rock phosphate is a fertilizer that comes from a mineral source. It is extracted from deposits of phosphate rock found in the earth. This fertilizer is particularly high in phosphorus, an essential nutrient for plants, especially for their root development and for producing flowers and fruits. The phosphorus in rock phosphate is released slowly into the soil, which is beneficial for plant growth over a longer period. This gradual release ensures that plants get a consistent supply of phosphorus as they grow.

12. Green Manure

Green Manure

Green manure is a unique and natural way to enhance soil health by growing certain plants specifically for this purpose. It usually involves fast-growing plants like clover, alfalfa, and ryegrass, chosen for their ability to improve the soil. The type of plant used varies, but they all serve the same purpose: to add valuable organic matter and nutrients back into the soil. When these green manure plants are ploughed back into the ground, they break down and enrich the soil.

13. Feather Meal

Feather Meal

Feather meal is a unique type of fertilizer created from ground-up poultry feathers, which are collected during the processing of poultry for food. This meal stands out because it is exceptionally high in nitrogen, an essential nutrient that plants, especially leafy ones, need to grow well. What’s beneficial about feather meal is that it releases nitrogen slowly into the soil. This slow release means that plants get a steady supply of nitrogen over time, which is particularly helpful for their continuous growth. Gardeners and farmers use feather meal by mixing it into the soil, focusing on plants that require a lot of nitrogen.

14. Wood Ash

Wood Ash

Wood ash, which is the residue left after burning wood in stoves or fireplaces, is a simple yet effective fertilizer. It is notably rich in potassium and calcium, two important minerals for plant health. One of the key advantages of wood ash is its ability to balance the pH level of the soil, particularly making it more alkaline. This makes it beneficial for adding essential minerals to the soil, improving its overall quality and fertility. However, it is important to use wood ash carefully, especially around plants that don’t do well in alkaline soil. A light sprinkling of wood ash on the soil can be enough to provide these benefits without the risk of harming more pH-sensitive plants.

15. Soybean Meal

Soybean Meal

Soybean meal is a fertilizer created from ground soybeans, typically the leftovers from producing soybean oil. It is particularly high in nitrogen, an essential nutrient for plants. This meal stands out because it releases nitrogen slowly into the soil, providing a steady and long-lasting source of this key nutrient. This slow release supports the overall growth and health of plants, making it an excellent choice for a variety of gardening needs. Gardeners usually mix soybean meal into the soil before planting, which gives new plants a nutritious start. It can also be used as a top dressing for established plants, offering them a continuous supply of nitrogen to maintain their growth and health.

16. Kelp Meal

Kelp Meal

Kelp meal is a natural fertilizer made from dried and ground seaweed, often specifically from kelp. It is harvested from the ocean and is known for containing a wide range of trace elements and a bit of potassium. These nutrients are important for the overall vigour and health of plants, helping them to grow strong and resist stress from environmental factors. The variety of nutrients in kelp meal makes it beneficial for providing plants with a well-rounded diet. It is simple to use – you can mix it into the soil when planting or add it as a top dressing to existing plants.

17. Fish Meal

Fish Meal

Fish meal is a fertilizer made from ground-up whole fish or fish parts, usually coming from leftovers in the fish industry. It is particularly high in nitrogen and phosphorus, which are essential nutrients for plants. These concentrated nutrients make fish meal an excellent choice for promoting rapid and healthy plant growth. It is especially beneficial in vegetable gardens.

18. Molasses


Molasses, a sweet syrup left over from producing sugar, comes from processing sugar cane or sugar beets. It is mainly composed of carbohydrates. In gardening, molasses is valuable because it feeds the beneficial microbes living in the soil. These tiny organisms play a crucial role in maintaining soil health by breaking down organic matter and making nutrients available to plants. By enhancing microbial activity, molasses improves the overall health and fertility of the soil. It is easy to use; just mix it with water and apply it to the soil or add it to compost piles.

19. Humic Acids

Humic Acids

Humic acids are beneficial substances obtained from humus, which is the decomposed organic material in soil. They come from the breakdown of plant and animal matter over time. Rich in humic substances, these acids are crucial for helping plants absorb nutrients more effectively. By improving how plants take up nutrients, humic acids play a significant role in enhancing their growth and health. Additionally, these acids improve the structure of the soil and its ability to hold onto nutrients, which is beneficial for all plants.

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