Feeding plants is complicated. However, you should remember you’re not feeding the plants, you’re feeding the soil. The plants use up nutrients in the soil, yes, but much like the human gut, soil is made up of microorganisms with specific jobs. They break down nutrients, so the plant can absorb them and stay healthy.
If you’re new to gardening or a new homeowner, a soil test would be beneficial. Or for a short-term solution, ask neighborhood gardeners about the soil quality in your area. Take a sample of soil to your local extension office for testing. Here in Arkansas, a basic soil test checks for pH factor, phosphorus, potassium, calcium, magnesium, sodium, iron, sulfate, manganese, copper, zinc, boron, and salinity. Soil tests are done by your local Cooperative Extension Service generally include fertilization recommendations. If you’re curious about the general pH levels of your soil, it’s possible to determine through a variety of home testing methods, like the ones on this site. Here’s a quick rundown on the uses and benefits of these additives.
Blood meal, which is a slaughterhouse byproduct, adds nitrogen back to the soil in a very efficient manner. Nitrogen is the nutrient that fluctuates the most in soil. Many plants are heavy nitrogen feeders, too, like corn, tomatoes, squash, lettuce, cucumbers, and cabbage. Blood meal is water-soluble and can be used as a liquid fertilizer. If you’re replanting the same garden bed year after year, blood meal will be beneficial, as plants have a tendency to deplete the soil. Blood meal will also make your soil more acidic, lowering the pH value. Blood meal acts quickly in the garden to fix nitrogen deficiency and a single application can effectively feed plants for 6 to 8 weeks. However, be careful when applying nitrogen to young plants, too much can burn them. For best results, try dissolving it in water or mix some into the soil when planting.
Bone meal adds phosphorus and calcium to the soil. It’s available in powder or granular form, and the powder form can be dissolved in water for fast-acting fertilizer. Granular bone meal is more of a slow-release additive. Unlike blood meal, bone meal won’t burn your plants if you add too much. If your soil testing indicates a shortage, add bone meal to your soil to help plants grow and flower. Again, pH testing is important because if your soil has a pH of 7 or higher, bone meal will be relatively ineffective. The acidity level must be addressed first. In addition, mixing bone meal with high nitrogen soil additives can balance out high nitrogen fertilizers like rotted manure. Note: if you have pets, keep bone meal away from them. It can be dangerous if ingested.
In short, your garden soil needs a variety of nutrients to thrive. Bone meal and blood meal are suitable substitutes that can help your garden be stronger and more productive. Blood meal is considered an appropriate additive for organic gardens. When it comes to using gardening products sourced from animals, organic is the safest bet.