Eye-catching “Joseph’s coat” roses (Rosa “Joseph’s Coat”) attribute shades of pink, coral and yellow on one blossom. This scaling rose grows in U.S. Department of Agriculture plant hardiness zones 5 through 9, where it can reach up to 10 feet tall and 8 feet wide. Bloom failure can result from many sources, however, a quick diagnosis and treatment program can help you avoid the disappointment of a terrible flowering period.
Cultural Issues
Deficiency of sunlight or inadequate soil can prevent a “Joseph’s coat” rose from producing flower buds or thriving efficiently. Check the website for appropriate drainage. If water stands on top the soil or if the soil feels muddy, then the rose might be a victim of the early signs of root rot. The soil must drain well but keep enough moisture that it doesn’t dry out entirely. Providing roses with 1 or 2 inches of water, or enough so that the soil remains moist to a 6-inch thickness, can enhance flowering. A 3-inch deep mulch layer helps conserve moisture. Supply the roses together with full, sloping sunlight, since “Joseph’s coat” will blossom weakly without enough sun.
Poor Nutrition
Roses need the appropriate nutrients to make flowers and buds. Too much hydrogen and not enough phosphorous in the fertilizer can cause healthy foliage growth but poor blooming. A high-phosphorous 9-18-9 formula, applied every three months from early spring during the summer, helps “Joseph’s coat” roses blossom better. Sprinkle 1 tablespoon of the fluid on top the soil, 6 inches away from the main trunk of this plant. Water following program so that the fertilizer soaks into the soil.
Pruning and Training
“Joseph’s coat” needs pruning in late winter, till it begins setting flower buds but following cold weather has passed. Pruning too late in the summer eliminates the developing flower buds and effects in few, if any, blooms. Wipe the jump pruning shears with a cloth soaked in rubbing alcohol to disinfect them before you prune. Cut diseased and broken wood back to your nearest healthy stage, making cuts in 1/4 inch of an outward facing bud. You may also head back overlong or crowded comes with the exact same pruning approach. As a climbing rose, “Joseph’s Coat” flowers best on horizontal divisions, therefore prune the plant to only two or three upwards canes and train the remaining posterior divisions horizontally along a trellis. The plant might have sparse leaves and leaf near its base. It is natural for “Joseph’s coat,” but it is possible to camouflage the bottom of the plant by surrounding it with summer flowering annuals.
Powdery Mildew
Serious infestations of powdery mildew, especially the year previously, can inhibit flowering. Mildew forms as a white, powdery growth on leaf surfaces, but it can spread to stems, unopened flower buds and blooms. In acute cases, the foliage dies from lack of sunlight and buds may fall without opening. It thrives in 60- to 80-degrees Fahrenheit in shady conditions. Good air circulation helps prevent mildew, so keep “Joseph’s coat” pruned and trained upright against a trellis to allow it to remain healthy. Prune out infected branches with disinfected shears and sprinkle the rose with water once daily in the morning to manage minor infections. Mix 1 teaspoon of neem oil and 1.2 teaspoons of liquid dish soap in a quart of water, and spray infected leaf till it is drenched to destroy more severe infections. Duplicate applications at 10-day periods may be necessary if the mildew persists.