Water Adequately

Diligently check the moisture level in the rose beds at least twice a week in dry summer weather. When watering, avoid frequent shallow sprinklings, which won’t reach the deeper roots and may encourage fungus.

Feed Regularly

Once a month between April and July, apply a balanced granular fertilizer (5-10-5 or 5-10-10). Allow 3/4 to 1 cup for each bush, and sprinkle it around the drip line, not against the stem.
In May and June, add in an additional tablespoon of Epsom salts along with your fertilizer; the magnesium sulfate will encourage new growth from the bottom of the bush.

Mulch Generously

Mulch, as an element to rose care, helps minimize weeds, keeps the soil moist and loose, and adds essential nutrients.

Prevent Pests and Disease

Removing dead leaves and canes will help reduce pests. Local pests to watch out for are:
Stem Borers
Japanese Beetles
Aphids
Spider Mites
Black Spot/Powdery Mildew

Prune to Promote Blooms

Pruning your roses keeps them blooming repeatedly all summer long.  Deadhead religiously and keep beds clean. Every leaf has a growth bud, so removing old flower blossoms encourages the plant to make more flowers instead of using the energy to make seeds. Clean away from around the base of the rosebushes any trimmed debris that can harbor disease and insects.

Stop deadheading all your rose plants 3 to 4 weeks before the first hard frost so as not to encourage new growth at a time when new shoots may be damaged by the cold.

These simple techniques for rose care will assure you a season of abundant flowers and healthy plants.