When the flowers, leaves or canes of a prized -- and pricey -- tree-form rose suddenly turn brown, the plant is suffering from an environmental problem or fungal disease. Those who wish to garden organically don't have the wide arsenal of chemical sprays to turn to that solve all your rose problems in one spray but may have deleterious effects on the environment. My Rose Stems Are Turning Brown Near the Roots. Roses also fall victim to leaf scorch when water is low and sun is fierce, or cold damage after a cold snap. Keep the plant consistently moist, and water your standards slowly and deeply to help excess soil salts from fertilizer to leach farther away from the root; this can help keep leaves green. If it is primarily at the edges, and the leaves are curled as well as discolored, excessive sun exposure is the culprit, and moving the plant to a shadier area after the last flowering is the best option. Avoid allowing plants to become crowded, and don't plant roses in a high-humidity area of your garden, such as an area that receives less sun or where mold problems have occurred before. Mechanical damage also causes brown canes, but sunburn on the exposed trunk -- when the cane is hit by direct sun -- usually on the south or west sides -- during the day. With most roses suitable for U.S. Department of Agriculture plant hardiness zones 4 or 5 through 9 or 10, depending on cultivar, be sure to pick one based on growing conditions in your area. American Rose Society Consulting Master Rosarian – Rocky Mountain District. Take time to look over your rosebushes and other plants well at least once a week as a minimum. Anthracnose, Downy Mildew, Rust and some rose viruses will also result in leaves going brown around the edges but also have other effects upon the leaves under attack. The leaves are turning yellow and falling. Maintaining a good fungicide spraying program will go a long way to keeping them at bay. Roses (Rosa spp.) and Hybrids-Bacterial Cane Blight, Marin Rose Society: Garden Bad Guys - Cane Borers, Worms Are Eating the Rose Leaves and Buds. Spraying the rosebushes well with a good insecticide at the earliest stages of having noticed a problem is very important. Black Spot will leave black spots on the leaves usually followed by a yellowing of the leaf once it has a firm hold on the leaf or leaves. Are the Green Leaves on Roses Poisonous for Cats? Buying disease resistant rose bushes does help, just remember they are “disease resistant” not disease free. Prune out and destroy infested canes. Why?” This is a commonly asked question. If using baking soda instead of purchased spray, mix one part baking soda with 15 parts water, and place in a clean laundry spray bottle. Unlike many treelike topiaries that are shaped by selective pruning, standard roses are usually made up of three different varieties grafted together -- a sturdy root stock rose is grafted onto a 3- to 4-foot mature straight-stemmed rose, which in turn has grafted onto it an attractive floribunda, hybrid tea or other rose that flowers prolifically and has a bushy habit. She has a Bachelor of Arts in journalism from Michigan State University, is an avid gardener and volunteers at her local botanical garden. If the infestation is small, remove diseased leaves and discard them in the garbage (do not discard them outdoors, since this can lead to the fungus spreading). In times of extreme heat in the gardens and rose beds, the roses can have problems getting enough moisture to the far outer edges of rose leaves, as well as the outer edges of the petals on blooms, thus they get burned by the heat.

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