A plant nutrient source derived from plant or animal material (compost, manure, bone meal, fish emulsion) that breaks down slowly and feeds soil biology while providing nutrition.
In plain terms
Organic fertilizers come from natural sources: compost, manure, bone meal, fish emulsion, seaweed. They release nutrients slowly as soil microbes break them down. This slow release feeds plants steadily and improves soil biology long-term. The tradeoff: they're slower-acting than synthetic fertilizers but safer for soil and provide secondary benefits like organic matter and microbe activity.
Why this matters
Organic fertilizers build soil health over time, support beneficial organisms, and are safer than synthetic alternatives for long-term garden sustainability.
In practice
Examples
Compost applied annually; feeds plants directly and improves soil structure over years.
Fish emulsion sprayed on plants; quick but mild nutrient boost; supports soil biology.
Bone meal in planting holes; slow phosphorus release promotes root development.
Manure mixed into beds; slow nitrogen and organic matter release; improves soil over seasons.
Practical applications
Apply organic fertilizer at label rates; more is not better.
Incorporate compost into beds annually; it's the best organic fertilizer.
Use fish emulsion or seaweed spray monthly during growing season for steady nutrition.
Organic fertilizers improve soil over time; results compound year to year.
Combine multiple organic sources (compost + manure + bone meal) for complete nutrition.