There are many pre-packaged organic fertilizers especially formulated for roses that take the guesswork out of fertilizing. Some also contain insecticides and should be avoided all together, as they can harm wildlife. However, these products don’t improve soil and have no positive residual effect. Inorganic fertilizers (synthetic, chemical, or man-made) are ready-to-use and convenient, more concentrated and often less expensive than organic.
Some also improve soil texture and support beneficial microbes. These have different nutritional advantages and can be used alone or in combination as part of your rose-feeding regimen. Organic fertilizers, which are derived from plant or animal matter, are better for the environment. (See more on how to grow roses in containers.) FOR CONTAINER ROSES:īecause nutrients leach out more quickly due to more frequent watering, container roses may need fertilizing more often than those planted in the ground. Stop fertilizing 6 to 8 weeks before your average first frost date to prevent new growth from being damaged by frost. Late summer to early fall: Apply a slow-release fertilizer with low nitrogen content such as bone meal to promote root growth and next year’s blooms. Throughout the season: Continue to feed every 2 to 4 weeks during the growing season depending on the type of fertilizer used. Add a slow-release fertilizer when shoots are 4 to 5 inches long. Use a high-nitrogen fertilizer or top dress with alfalfa meal (5-1-2) for the first application to jump-start leaf development, along with epsom salts to encourage new cane development and lusher growth. FOR ESTABLISHED ROSES:Įarly to mid-spring: Begin fertilizing when new leaves emerge. If a new plant dries out at all, full-strength fertilizers can cause leaf margins and root tips to burn.
Sprinkle 1/4 to 1/2 cup of Epsom salts around the base of the plant to promote foliar and cane development.Ĭontinue to fertilize every 3 to 4 weeks with a mild fertilizer such as fish emulsion.Work in a slow-release fertilizer according to package instructions along with a handful of bone meal for healthy root development.Amend the planting hole with rich organic matter.
HOW AND WHEN TO FERTILIZE ROSES FOR NEWLY PLANTED ROSES: Other nutrients: In order to thrive, roses also need micronutrients including calcium, magnesium, sulfur, boron, copper, iron, manganese, and zinc. Lack of potassium can result in yellow leaf margins, weak flower stems and poorly developed buds. Potassium, also referred to as potash, helps roses recover when stressed by insect and disease damage, or by extreme weather conditions. A shortage of phosphorous can result in leaf drop, weak flower stems, and buds that won’t open. Phosphorus promotes healthy root development and abundant flower production. Too much nitrogen will result in too much foliage and fewer blooms, while not enough nitrogen results in yellow leaves, stunted growth and smaller blooms. Since a rose’s ability to make flowers resides in its leaves, healthy foliage results in more flowers. Nitrogen encourages healthy, vigorous leaf growth. The primary nutrients (macronutrients) that all plants need are nitrogen (N), phosphorus (P) and potassium (K). Here’s what you need to know to get the most out of your roses. There are many different kinds of fertilizers, so it can be confusing to know how and when to fertilize your roses. Healthy roses not only bloom better, they are better able to withstand insect and disease problems. To perform their best, roses need a continuous source of nutrients throughout the growing season.
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