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If you’re unsure of your specific garden fertilizer needs, generally you’ll not go wrong applying 10-10-10 fertilizer an “all-purpose complete fertilizer” or balanced fertilizer for plants.
Fertilizer 10-10-10 includes equal percentages of nitrogen (N), phosphorus (P), and potassium (K), the NPK of a particular mix of a fertilizer.
This complete fertilizer is a popular and common form of fertilizer on the market.
Knowing when to apply 10-10-10 fertilizer depends on the types and ages of plants you grow.