List of Organic Fertilizers

Do you want to help the environment and grow those big tomatoes?


I believe the key to a favorable outcome of organic fertilizers is to be loyal to its application and use. Know that when you use plant food and organic fertilizers that the results will take a little longer but the lasting results are much longer and more healthy. The list here is not all there is but what has worked for me. They represent materials found all around us and have been there for many centuries.

Alfalfa Meal— A plant food growth regulator, rich in vitamins and minerals. NPK is 3-2-2. A green manure crop made from alfalfa that has a plant growth regulator hormone. It starts or re-starts vigorously millions of microbes that will then trigger soil organisms that convert the bordering nutrients into an useable form to plants.

For more information about alfalfa meal please watch my VIDEO

Azomite— NPK is 0-0-2.5 and 5% Calcium. A natural volcanic mineral-rich in trace elements. Azomite may be used with potting soil, indoor plants, gardens and mix in with compost and your favorite organic fertilizer.

Bat Guano— Bat excretions or bat guano, a natural fertilizer containing nitrogen and lots of trace minerals.

Blood Meal— A dried blood material with nitrogen of around 12%. One of the highest non-synthetic sources of nitrogen. Use in the compost pile. Blood meal is a slow-release source of calcium and phosphorus used to increase phosphorus levels. NPK is approximately 12-1-1.

Bone Meal, steamed— The NPK is 1-13-0. Bone Meal is the best source of phosphorus and also has calcium and some trace minerals. It is a slow-release therefore, it is a safe fertilizer when potting young or new plants.

Coffee Grounds— The world is finding out that a tossed material is rich in nitrogen and should be added in the garden and compost piles. Ask your local coffee shop for their supply of coffee grounds.

Compost— Considered the best organic fertilizer because it is high in microorganisms, humic acid, enzymes, vitamins, and humus. Make your own compost.

Corn Gluten Meal— A natural fertilizer and pre-emergent herbicide. Apply Corn Gluten Meal at the right time of year – before spring growth.

Cottonseed Meal— Made from cottonseed. Compost 1st to rid toxic chemicals. Use in the compost pile. NPK is 6-1-1 considered by many to be the second-best source of nitrogen after blood meal. It is a slow-release fertilizer. It also adds acidity to the soil.

Cover Crops— They are leguminous plants like clover, grains, rye, and oats. Cover Crops are planted for use as a green manure.

Crab Meal— NPK is 5-2-0.5. A soil improver which is a by-product of the crab industry. Once kiln dried they are ground up into the meal. Crab Meal will add life to the soil by furnishing a protein chitin food for microorganisms.

Earthworm Castings— (vermicompost, vermiculture, vermicompost) An organic fertilizer high in useable minerals and bacteria. The NPK is high with over 60 trace minerals, considered an ideal additive to soil. Earthworm Castings is made from worms digesting organic matter and passes the castings. Ammonium sulfate is toxic to earthworms.

Epsom Salt— Hydrated magnesium sulfate, used as a quick-acting reservoir of magnesium and sulfur. These are elements that are required in the soil. Epsom Salt is an outstanding fertilizer.

Feather Meal— NPK is 12-0-0. Feathers are ground up into a meal. Nitrogen is released over a long period of time. Feather Meal is used to enhance green leaf growth, initiate compost decomposition and get better soil structure.

Fish Emulsion— An organic fertilizer produced from fish or fish by-products. Add seaweed to it and it will make an excellent fertilizer. Fish Emulsion‘s NPK is approx. 4-1-1 to 7-2-2.

Granite meal— Ground from soft granite into rock powder. Good potassium to help produce starch and sugar for the plants. Granite meal‘s job is to furnish trace mineral content where the soil has been used too much and deficient in trace minerals.

Greensand— An organic fertilizer which is a good source of iron, potassium, and trace minerals. Greensand is mined from ancient seabeds.

Gypsum— An excellent source of the micronutrients sulfur and calcium. Because of Gypsum‘s draining capabilities and provides aeration it is added to clay soils.

Humates— (Humic substances) A source of humic acid which is a natural organic lawn fertilizer with trace minerals and is the result of nature successful compost. Humates smells like the forest decayed leaves.

Kelp Meal— Ground-up dried seaweed. A good source of copper and boron. Abundant in plant food growth hormones. Kelp Meal is a natural source of chelated trace elements that enhances the health of the soil and plants.

Lava Sand— Ground up lava, rich with trace minerals, Lava Sand has a water-holding ability.

Lime— Gives soil an adjustment of the pH, reduces acidity, Lime contains calcium that keeps magnesium low.

Manure— Not human’s in this country. Manure is rich in nitrogen and can be obtained from many different animals, even horses. It should be composted before using because it’s nitrogen and ammonia can burn plants.

Molasses— A food for soil microorganisms. It contains trace minerals, sulfur, and potash. Molasses is a very important part of the complete organic program.

Potash— A material containing potassium. It can be potassium carbonate from wood ashes. Where potassium is deficient in the soil, potash fertilizers can correct the problem and boost crop yields and quality.

Rock Phosphate— A dry organic fertilizer. NPK is 0-25-0. A natural source of phosphorus, calcium and essential trace elements. It gets to build phosphate fertility, increase root activity in seedlings and transplants. Rock Phosphate enriches the soil and quality of the crops.

Seaweed— A saltwater plant that will accelerate root growth and has more than 60 trace minerals demanded by plants. This organic fertilizer, Seaweed, if added with fish emulsion will make the best complete fertilizer.

Soft Rock Phosphate– Aka Colloidal Rock Phosphate. A soft, natural colloidal clay releases its nutrients slowly. Unlike other phosphates, it has colloidal clay that can tie up sandy soils and contribute to their nutrient holding volume.

Sulfate of Potash— NPK is 0-0-52. A natural potash that is 51% soluble. Sulfate of Potash is second only to nitrogen in the amount required for plants. It can be applied as a supplement or mixed with other materials. Do an accurate soil test before applying.

Sul-po-mag— Natural fertilizer. Sul-po-mag is a source of 22% sulfur, 22% potash and 11% magnesium.

Sustane, aka composted turkey manure.– A very fast acting 100% composted organic fertilizer. NPK is 5-2-4. Made from real turkeys.

Related How To article: 3 Ways to Choose Organic Fertilizer

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