Fertilizing roses now leads to winter damage

Q. I read August is the month to stop fertilizing roses. Why?

A. Fertilizer should not be applied after Aug. 15. Fertilizing roses into the late summer encourages continued growth of the roses and increases the chances of winter rose damage because it encourages "soft, succulent" growth. Interestingly, roses can be fertilized after the plant has gone dormant. This will not encourage growth but will allow nutrients to be available in the spring when it begins to grow. At this time, a fertilizer high in potassium will increase the roses' hardiness to winter.

Healthy roses start with a fertilization program in the spring. Species roses (low maintenance, blooms once a season) usually require one feeding a season. Frequently one-half to 1 cup of 10-10-10 or 12-12-12 fertilizers are used for each plant. It is spread 6 inches from the crown of the plant going out 18 inches around the plant. Gently work it into the soil and water.

All your other roses require this spring application and your second application should be around the June 15 or at the end of the spring bloom. Continuous blooming roses require a third application in the middle of July.

If you mulch your roses, which is recommended 2 inches to 3 inches deep, leave a 6-inch radius around the crown. Mulching will retain soil moisture and retard weed growth.

Fall rose care is similar to most perennials. You will still need to provide your "beauties" with at least 1 inch of water a week. The best form of watering roses is with a soaker hose as adequate amounts of water can be provided while keeping the foliage dry. This is most important in preventing disease.

For more information on the care of roses, visit thr website extension.illinois.edu/roses/water.cfm.

- Bev Krams

• Provided by Master Gardeners through the Master Gardener Answer Desk, Friendship Park Conservatory, Des Plaines, and University of Illinois Extension, North Cook Branch Office, Arlington Heights. Call (847) 298-3502 Monday, Wednesday and Saturday or (847) 201-4176, ext. 14, on Fridays.