Fertilizer Chart

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Plants need Food. 

To get the best rate of growth, the biggest, tastiest fruit, and the most beautiful blooms, it's important to give plants the best nutrition.
Once you understand the 3 numbers on fertilizer bags and boxes, you can give your plants only the nutrients they need, instead of spending money on nutrients they don't need.

These 3 numbers are a code that represents the 'N-P-K Ratio' - the ratio of three primary plant nutrients that may be contained in each bag or box.
This code is there to show you the ratio of nutrients at a glance, so you easily select the correct fertilizer, and the nutrients (NPK) are always displayed in this order.

Nitrogen (N) - Phosphorus (P) - and Potassium (K)

N = Nitrogen - Energizes vegetative growth,
P = Phosphorus - Produces expansive roots, flowers, fruits, and viable seeds.
K = Potassium - (or potash) Promotes resistance to disease and temperature stress. 

Most fertilizers will also contain varying amounts of the secondary macronutrients – calcium, sulfur and magnesium – along with trace elements or micronutrients. Read More 

For example,
When you shop for a Blended Fertilizer (or Mix), like
All-Purpose Mix 4-6-2
The 3 numbers with dashes are the NPK code, showing you the ratio of the three main nutrients found in fertilizers:
Nitrogen (N), Phosphorus (P) and Potassium (K).
This mix has an N-P-K ratio of 4-6-2, meaning it is highest in P, or Phosphorus.
4 (N) -  6 (P) - 2 (K)

When you shop for a Single Ingredient Fertilizer, for example, Blood Meal 12-0-0 
The 3 numbers with dashes are the NPK code, showing you the ratio of the three main nutrients found in fertilizers:
Nitrogen (N), Phosphorus (P) and Potassium (K).
This mix has an N-P-K ratio of 12-0-0, meaning it is highest in N, or Nitrogen, with no Phosphorus and Potassium.
12 (N) -  0 (P) - 0 (K)
Each nutrient plays specific and complementary roles to help the plant grow.