What do the numbers on a bag of fertilizer mean?

Have you ever wondered about it?
They are simply percentages by weight of the three most essential elements, always listed in t his order”
Nitrogen (N), Phosphorus (P), and Potassium (K).
So, 10-10-10, for instance, means that each element makes up 10% of the mix or 30% together.
The other 70% is filler that helps in distribution. Various mixes are available.

Nitrogen helps your lawn grow lush and green, and generates a leafy foliage in garden plants. A high Nitrogen count in spring helps get plants popping.
Phosphorus helps promote healthy root systems, flower blooms and fruit production. If you want the plant’s energy go towards flowers or fruit rather than leaves, pick a blend with the middle number higher than the first.
Potassium helps build strong cells which keep the plant healthy in the stress of heat, cold, pests or disease.  A high third number in the fall will help keep plants in good shape over winter and into spring.

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