Flower fertilizer is composed of macronutrients, micronutrients and various trace elements. Macronutrients are the three elements that are most needed by plants. These are nitrogen, phosphorous, and potassium. Nitrogen is needed for new growth of leaves and stems. Phosphorous is needed by the roots and the bulbs that form flowers. Potassium promotes overall health and vitality.Primary micronutrients are calcium, sulfur, and magnesium. Calcium helps new roots grow, and it improves the vigor of plants. Sulfur gives leaves that dark green color so desirable in landscaping. Magnesium, among other things, promotes seed formation and vigor.
Of all these elements, potassium is the most important because it causes flowers to bloom more.
Lawn fertilizers are counterproductive to flower gardens because they make the leafy parts of flowers greener, but they do nothing to stimulate flowering.
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