When it comes to growing roses, there are two prerequisites: 1)
get the best quality roses you can find, whether it be old roses
or hybrids, and 2) plant it correctly in a site suitable for
growing roses.
Roses need to be planted where they maximize sunlight and air
circulation. In Alabama’s long, sultry hot summers, there is no
such thing as a disease-free rose. There are however, many rose
varieties that are more disease resistant than others to
black-spot, powdery mildew and cane diseases. Check with
nurserymen in your area, or guides such as Southern Living
garden books for recommended disease resistant varieties for the
South.
Roses are tough plants when grown in well-drained soil,
enriched with organic matter, and where there is good sunlight and
air circulation. You can expect some shedding of leaves as they
succumb to fungus diseases, but fall is an excellent time to
rejuvenate roses for a beautiful show of color before they rest
for the winter. Fall is one of the better seasons in Alabama for
plant growth and flowering. With adequate watering, some
fertilization and clean up, you’ll enjoy many weeks of colorful
blooms.
Prune out any dead or diseased canes and spent blooms. The
amount and type of pruning needed depends upon the variety, but
don’t prune as heavily as is done in the spring. Mulch is key to
growing roses successfully in the South. Fall is a good time to
rake out old mulch and diseased leaves that have shed during the
summer. Replace with 3 to 4 inches of clean pine straw. If you don’t
have enough pine straw, use leaves shed from shade trees topped
off with an inch or so of pine straw. The leaves will decay over
time, adding humus to the soil.
The tender, new growth that roses put on after pruning will
most likely require protection from sucking pests such as aphids,
thrips and beetles. Insecticidal soap is your first line of
defense against aphids and sucking insects. A pyrethrin
insecticide, Orthene or Sevin is recommended for control of adult
beetles.
Roses respond well to cooler nights and less humid days if you
provide the moisture they need and one last application of
fertilizer in early fall. If you’ve used a complete fertilizer
such as 10-10-10 during the spring and summer months, only a small
amount of nitrogen should be used, such as one-half pound of
ammonium nitrate (34-0-0) broadcasted per 100 square feet of bed.
Wash any fertilizer off leaves and keep roses well watered. An
alternative would be to continue using a water-soluble fertilizer
about every two to three weeks until six weeks before the first
expected killing frost. This will allow roses time to begin their
dormancy period before freezing weather arrives.
Source: Mary Beth Musgrove, Extension Home Horticulture
Associate, Alabama Cooperative Extension System, (334) 844-5481