A fertilizer with a high concentration of nitrogen, compared to the other ingredients, is useful for home lawns, deciduous and evergreen trees and to accelerate the growth of most plants. The second number states the concentration of phosphorous in the package. Phosphorous is also useful in vegetable production since it promotes flower set and heavy cropping. In flower production, phosphorous is required to produce robust blooms. The third number on the label states the concentration of Potassium.
Potassium is required by plants to assist in the uptake of other nutrients.
It is associated with increased hardiness and vigour for all plants. Although the immediate effects of potassium is unseen, it makes a tremendous difference in the overall health of the flower and vegetable garden. The balance of the three major nutrients is an important consideration when choosing the proper fertilizer. As a general rule, lawn fertilizers should be used exclusively for turf. If you are looking for a good all-purpose fertilizer for the flower garden, select a product which is high in phosphorous and contains a medium amount of nitrogen and potassium.