Have you ever wondered what the hyphenated numbers on all fertilizer packages stand for? They represent the percentages of nitrogen (N), phosphorous (P), and potassium (K) — the three major nutrients that plants need.
Nitrogen is the main nutrient for new, green growth. Its concentration is especially high in fertilizers for lawns as grass must continuously renew itself after mowing.
Phosphorus promotes root development and increases fruits and blooms. All newly transplanted plants require lots of phosphorus to grow deep, strong roots. Fruits and blooms will also require a lot of Phosphorous to grow bigger and brighter.
Potassium improves the overall health of plants. It strengthens them, helping them withstand very hot or cold weather, and helping them defend against diseases. For vegetables it helps them carry a heavy load.