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Actually, fertilizer is a variety of elements, suspended in water which is made available to enter the plant through roots or leaves. The cycle is simple. Leaves and insects eating plants fall to the soil, rot and provide food for the plant again. Humans however interrupt this cycle because little is allowed to go back into the soil. We deadhead, remove weeds and clean up dropped leaves, so our soil is not replenished naturally. The rose grower has to return these natural elements to the soil. Fertilizing roses is a process of maintaining a soil balance. The natural elements in chemical form are nitrogen, phosphorus and potash. (N, P, and K). Minor elements include calcium, magnesium and the trace elements of boron, iron, manganese and several others. To much of anything can be harmful but a lack of any one thing can show up as a deficiency. Lack of potassium, for example, shows up as leaves with brown or purple edges, yellowing leaves as a lack of iron or to much calcium. When you look at a box of "Rose Food", look at the label for three numbers; 6-8-6 for example. This box contains 6% nitrogen, 8% phosphorus and 6% potassium or 20% fertilizer elements and 80% filler; sand, clay, ground up farm waste, whatever! The nitrogen gives stronger stems and greener foliage, phosphorous helps the reproduction system and therefore helps with blooms and hips, and potassium helps in root and stem development. Often the label will also mention small quantities of other minerals in the mix. ![]() Organic fertilizer is anything derived from formerly living plants or animal matter. Bone meal, green sand, kelp, fish pellets, canola pellets, alfalfa, or the various composted manures. Organics break down slowly and enrich the soil, while chemical fertilizers, especially soluble ones, react quite quickly. Normal powder fertilizers can take up to three months to start working! Fertilizing roses needs to include a combination of materials spread over a period of time. [Please see our other article on "Organic Fertilizers" which should be consulted in tandem with this one.]
Build up the well rotted compost on the rose beds for the winter, level out in spring as a mulch and leave until the next fall as a fertilizing agent. Apply a small handful of chemical fertilizer to each plant, as the soil warms up in the spring and again in mid July after the first blooms fade. Do not apply any more. Easy Eh? Well not exactly because there is the question of organics and the making of organic fertilizers. It is possible to have a complete and successful fertilizing program without the chemical fertilizers. Did you check out the article on organic fertilizers? Return to Cultivating Roses from Fertilizing Roses
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