South Central Texas Rose Growing "When the going gets tough, the tough get going" has to be the motto of a rose grower. Everything that this area is famous for--heat, drought, alkaline (basic) soils, insects and disease--roses detest. But "if it were easy, anyone could do it," so every spring rose growing enthusiasts plant thousands of rose bushes. Some areas have deeper soils which are not as alkaline so the rose's life expectancy is enhanced. However, most of us are not blessed with such an excellent planting situation and have to contend with four inches of topsoil and sixty feet of rock. When confronted with adverse soil conditions, the rose grower will "modify" the growing area. The general recommendation is to choose a sunny location, loosen or till the soil, and construct a raised planting bed with railroad ties, bricks, etc., to a height of about eight to ten inches. Four to six inches will do for a mini-bed. Fill it with a loose, somewhat acidic soil mix. A good mix is basically one-third grainy, washed sand; one-third peat or compost and one-third topsoil. (For more information, see the American Rose Society: Soil) Recommended Varieties for South Central Texas There are many varieties that just won't do well in the San Antonio area because of the weather and soil conditions. Listed below are some cultivars in each of the major classifications of roses which grow and bloom well in the SOUTH CENTRAL Texas area. CLIMBERS
Before you dive into the excitement of growing your own roses, let me warn you of certain problems which will sooner or later be encountered.
Pest Control Blackspot - identified by black spots and yellow colored leaves. It is probably the most common disease in this area. It is usually in evidence when the weather is cool and damp. Once established, it is almost impossible to eradicate for the rest of the season. Normally it is transferred from bush to bush by rain or watering that splashes the spores upward from the soil. The best control is obtained by spraying with Ortho Funginex or Daconil and keeping the lower leaves removed from the bushes. Once blackspot is detected, spray about twice a week and remove infected foliage (from beds as well as from bushes). Prevention is the best cure. Powdery Mildew - The chief symptoms are buds and top growth covered with a white, powdery material. in time this will cause the leaves to curl. Powdery mildew is usually evident when days are warm and nights are cool. Normally it is non-existent in this area in the summer months. The best treatment is prevention by spraying bushes weekly with Ortho Funginex. If mildew is present, spray about twice a week until eradicated. Rust - This is a fungus rarely ever seen in this area. It looks like small piles of rust under the affected leaves and should be prevented by spraying regularly with Funginex.
Insect Problems Aphids - these are succulent, light green insects that cover the buds and new growth, They are sometimes found inside deformed flowers and will leave white streaks on petals. Cane borers - These insects will enter a fresh wound and cause considerable damage. Paint large cuts with a sealer to prevent this problem. Corn Ear Worms - These worms will bore a hole into the flower bud. Cucumber Beetles - This small green and black spotted "ladybug" is common in the San Antonio area. it will be found in and around the bloom and eats holes in the lower, inside portion of petals. Leaf Cutter Bees - The cutter bee will cut circular holes in individual leaves. They use the "cutouts" to line their nests which can often be found around piles of wood or other debris. Spider Mites - These are tiny, microscopic pests which are generally found on the underside of the leaves in hot and dry weather. The leaves turn yellow and gray, then brown and drop off.
COMMON ROSE PROBLEMS IN THE SAN ANTONIO AREA
Common rose deficiencies in this area Nitrogen deficiency - A plant that lacks nitrogen will display pale green foliage and veins. Moreover, growth on the top becomes shorter, buds fail to develop in a proper fashion and small and poorly colored flowers result. Nitrogen deficiency is common in alkaline soils. It can also result when straw, hay or sawdust is used as a mulch. As the mulch breaks down, nitrogen is extracted from the soil. Supplemental nitrogen may be added in the form of water soluble products such as calcium nitrate, granular urea or organic blood meal. The use of composted mulch is recommended.
Other problems Canker - There are several types of canker. One of the more common types in this area is stem Canker which can be recognized as a dark sooty area near a wound. The best treatment is to remove and destroy the infected plant. Die Back - Die back is not a disease but a symptom that is connected with many diseases. Two things can be done for die back. First always cut flowers at the base of a leaf axil. Second, when die back is present, cut below it to a five leaf axil or bud eye. Mosaic - A virus which manifests itself as a yellowish, irregular patterning on the foliage. Mosaic virus is introduced by using either infected budwood or infected rootstock and may actually lie dormant in the bush for several years. Currently, there is no known cure and as long as "variegated" foliage is of no consequence, the bush can have a very productive life. |