Dried blood and crushed horn: two fertilizers rich in nitrogen

N, P, K. Does this alphabet of fertilizers ring a bell? This is surely because these three elements are essential for the growth and development of your plants.

Nitrogen (N) helps plant development, phosphorus (P) strengthens them and potassium (K) boosts flowering and fruiting. To ensure a good yield in the vegetable garden or to obtain a flowering garden, fertilizers are essential! There is no question of switching to the dark side of the force by using environmentally harmful chemical fertilizers. Some natural fertilizers are very effective, especially those of animal origin.

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Fertilizers of animal origin

Mowing residues, peelings, carrot and radish tops, leaf molds, vegetable cooking water, leaf manure ... It is customary to use plant-based fertilizers to form mulches and other composts. Nature is well made and offers plants everything they need. The ground is thus always covered with vegetable matter but also animal: dried blood, crushed horn, guano, bone powder, eggshells. Feel free to combine the two in favor of generous florals and tasty fruit.

Dried blood: the boost

Sold in powder form, this nitrogen concentrate will generate good growth. It is applied in the spring in the vegetable garden or at the base of ornamental plants. Just pour powder on the substrate and scratch to make it penetrate.

Also known as dried blood, it is commonly used for flowering plants and has the advantage of delivering results quickly.

Do not hesitate to put some in your potted plants to provide them with the elements that they cannot draw from their above-ground substrate. For lawn use 50g / m2 against 75g / m2 for a vegetable garden or a bed. A space including shrubs or trees then requires 125g / m2.

Crushed Horn: slow diffusion

The crushed horn slowly releases nitrogen which allows it to provide nutrients throughout the plant's growing season (March to October).

It is an ideal fertilizer for a young plant because it will support its development over time and promote good rooting. Therefore, it is used in the fall during the planting period but also in the spring, especially for repotting. For the vegetable garden and flowering perennials, stick to 75g / m2 against 50g / m2 for heather earth plants. A tree or shrub requires an intake of around 400g.

Be careful not to exceed these benchmarks because the excess nitrogen favors the development of the foliage to the detriment of that of the fruits and flowers.

Other animal fertilizers


Composed of sea bird droppings, guano is rich in nitrogen and phosphorus. It is used both in the vegetable garden and in the ornamental garden. Like dried blood, it is a boost fertilizer. The recommended dosage is 50g / m2.


Eggshells are used for their calcium content. Indeed, plants also need other nutrients besides N, P, K! Incorporate your eggshells into your compost or spread them as a mash at the base of the plants, use a handful per plant. Then scratch to make it penetrate.

Bone powder:

Rich in phosphorus and calcium, bone powder is an effective fertilizer. It promotes good rooting as well as the development of flowers and fruits. Apply it the same way as eggshells or directly into the planting hole. Count at 75g / m2 for perennial beds, at 100g / m2 for the vegetable garden and the bulbs, 75g per shrub and 150g per tree.

To read → Soil or compost: what's the difference?

Video: Workshop on Nutrient Management Options for Boosting Organic Agriculture 28-30 May, 2020 (September 2021).