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The Best Plant Food for Roses

By Bethany Wieman ; Updated September 21, 2017
Take care of your roses and they will reward you with beautiful blooms.

Roses are one of the most timeless, beloved flowers. They are stunning as cut flowers or as focal points in the landscape. Not difficult to grow, these gorgeous plants just need regular care. Roses will thrive with a regular feeding program and produce loads of beautiful, fragrant blooms. Many different types of fertilizers made specifically for roses are available, including water-soluble, granular, organic and inorganic forms.

Organic Amendments

Epsom salts contain magnesium sulfate, an ideal spring food for roses.

Start your roses off with organic food in the spring. According to Jill Barnard with the American Rose Society, this slow-release recipe will ensure healthy plants as the soil warms up. She suggests mixing 1 cup bone meal, 1 cup cottonseed meal, and 1/2 cup each of blood meal, fish meal, and epsom salts for each plant. After watering, apply this mixture to the soil in a band starting about 6 inches from the base and going out to about 18 inches from the base. Work the fertilizer into the first 2 inches of soil and then water again. If mixing up your own rose food isn't your thing, other premixed, commercially produced amendments are available. Paulette Mouchet, former editor of "The Rose Garden" newsletter, suggests using fish hydrolysate to fertilize roses. Fish hydrolysate is liquid and can be applied to the foliage or used as a soil drench. This byproduct of the fishing industry boasts proteins, vitamins, amino acids, enzymes and necessary micronutrients that are readily absorbed by the plant's roots.

Balanced Rose Food

Nitrogen helps maintain a rose's green foliage.

Balanced rose food is a granular fertilizer that has a blend of nitrogen, phosphorus and potassium, sometimes referred to as "NPK" on the package. A casual rose grower should look for an NPK ratio of 10-10-10 and apply this formula every four to six weeks until late August. A 10-10-10 formula means that the fertilizer contains 10 percent nitrogen, 10 percent phosphorus and 10 percent potassium. The rest is filler material. According to Kansas State University extension agent Dennis Patton, roses require a constant supply of nitrogen (N) for green leaves and vibrant blooms. A nitrogen-starved rose will often exhibit yellowed leaves and stunted, pale blooms. Phosphorus (P) is an important element needed for a rose to develop strong roots and an abundance of flowers. Potassium (K) ensures strong stems, vibrant growth and well-developed buds. Although the flowers are the focus of any rose plant, it requires 25 to 35 leaves to produce one rose bud so it's important to keep the leaves healthy as well.

Liquid Fertilizers

Food for miniature roses should be diluted.

Liquid fertilizers, such as Miracle Gro, are convenient for homeowners that have a large number of plants to feed. This plant food can be applied using a hose-end sprayer. The sprayer has a dial on it so homeowners can adjust the concentration of the fertilizer. Follow the instructions from the manufacturer when mixing up and applying liquid fertilizers. If you only have a few plants to feed, 1 tbsp. of the liquid fertilizer is generally dissolved in a gallon of water for each plant. Miniature roses should receive a more diluted version -- 1 tsp. dissolved in a gallon of water. Give the miniature roses about a quart of this formula per plant. Liquid fertilizers have one drawback. Since they are water-soluble, they can wash away during the hot summer months when roses need to be watered often. Granular fertilizer may be a better choice during the hot summer months.

Controlled-Release Fertilizer

Large climbing roses need more fertilizer than shrub roses.

Another convenient option is to use timed or controlled-release plant food, such as Osmocote. These products are encapsulated fertilizers that release their nutrients slowly -- usually over two to eight months. According to the University of Illinois Extension, soil temperature and moisture level influence the release rate of encapsulated fertilizer. Apply controlled-release fertilizer in May. Although you should follow the manufacturer's directions, generally each plant should receive about a half cup. Like the granular fertilizer, this should be lightly worked into the soil in a band starting about 6 inches away from the base of the plant. Controlled-release fertilizer is another convenient option for the casual rose grower, as it may only need to be applied once or twice throughout the season.

 

About the Author

 

Based in the Midwest, Bethany Wieman has been writing articles about gardening, DIY, finance, travel and sustainability for more than 10 years. She was featured in the book "The Complete Guide to Growing Vegetables, Flowers, and Herbs from Containers." Wieman's professional background is in marketing, working with such brands as Swiss Army, Timberland and Callaway Golf. She holds a Bachelor of Arts in English.