Why do good quality triple-pack nutrients come in Grow

Why do good quality triple-pack nutrients come in Grow, Bloom and Boost options?
Optimum and Power Gro are both available in two distinct formulations, each with a different ratio of the macro elements. The Grow formulation is designed to supply the needs of the plant during the vegetative stage of its growth cycle. High levels of nitrate-Nitrogen will encourage rapid leaf and shoot growth and maximise the potential of the young plant to produce fruit and flowers later in its life. The bloom formulations are dedicated to the fruiting and flowering stage of plant growth, containing reduced levels of nitrogen but greatly enhanced levels of phosphorous and potassium, the elements required for development of buds and flowers. The change over from grow to bloom is especially recommended for strawberries, tomatoes and flowering plants. Ionic and GH Flora include the above with an extra Boost formulation to enhance the Grow and Bloom nutrients.

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