Organic Fertilizers: Bone Meal, Blood Meal, and More
Organic fertilizers are nature’s way of replenishing soil nutrients—slowly, steadily, and sustainably. Let’s break down some of the most common options and how to use them effectively.
What Are Organic Fertilizers?
Organic fertilizers are derived from natural sources—plant, animal, or mineral. Unlike synthetic fertilizers, they release nutrients gradually, improving soil structure and feeding beneficial microbes along the way.
Common Organic Fertilizers and Their NPK Values
The NPK value stands for Nitrogen (N), Phosphorus (P), and Potassium (K)—the three main nutrients plants need. Here’s a comparison of some popular organic fertilizers:
| Fertilizer | Typical NPK | Best Use |
|---|---|---|
| Bone Meal | 3–15–0 | Boosts root growth and flowering (high in phosphorus) |
| Blood Meal | 12–0–0 | Provides a quick nitrogen boost for leafy greens |
| Worm Castings | 1–0–0 | Improves soil health, adds microbes, mild nutrient boost |
| Compost | Varies (around 1–1–1) | General soil amendment and slow-release fertility |
| Seaweed | 1-0-1 | General soil amendment and slow-release fertility |
Why Choose Organic Fertilizers?
- Improves long-term soil structure and health
- Feeds beneficial soil microbes
- Less risk of nutrient “burn” compared to synthetic fertilizers
- Often a byproduct of other industries—reducing waste
Tips for Using Organic Fertilizers
Organic fertilizers work best when combined with good soil-building practices. A few guidelines:
- Mix bone meal into soil at planting time for bulbs and perennials.
- Sprinkle blood meal lightly—too much can burn plants.
- Top-dress beds with worm castings or compost for slow-release benefits.
- Combine different organic sources for balanced nutrition.