Richard Bogren, Gill, Daniel J. | 1/26/2018 1:27:17 PM
By Dan Gill
LSU AgCenter Horticulturist
(01/26/18) Now is an excellent time to consider adding roses to your landscape. For many gardeners, particularly those just getting into roses, a rose is a rose. But several different categories or types of roses are available, and within each type are numerous cultivars. Before you go to the nursery, it’s important to think about the type of roses you want to grow so that you make the proper selections.
Decide how you want to use roses in the landscape and why you intend to grow them. Consider how large you want the bushes to be. For example, Knock Out roses can reach 6 feet tall while Drift roses tend to stay under 3 feet tall.
The trend these days is to incorporate roses into landscape plantings just like any other shrub. This works particularly well with the old garden roses, landscape roses, polyanthas and floribundas.
The following is not a complete list of all the many types of roses but includes some of the more popular categories that will do well in our area. Repeat-flowering (everblooming) roses bloom intermittently from around late April to early December. Once-blooming roses bloom profusely around May and produce few or no flowers afterward.
Modern roses — Types developed after 1867, the year the first hybrid tea was introduced.
Hybrid tea roses produce large, exquisitely shaped flowers generally produced singly on long stems for cutting and in an amazing range of colors. The plants range in size up to more than 6 feet tall and can be leggy and awkward in appearance. Highly susceptible to black spot, these roses generally require regular spraying and pruning to remain healthy and vigorous. These are repeat-flowering.
Grandiflora roses are tall plants that produce hybrid tea-like flowers singly or in clusters of a few flowers on long stems. Generally comparable to hybrid teas, they also require similar care. These are repeat-flowering.
Polyantha roses are vigorously growing bushy plants that produce small flowers in large clusters or sprays, and are excellent in landscape plantings. Most are relatively disease resistant, and they are some of the more reliable and easy to grow roses for our state. These are repeat-flowering.
Floribunda roses are a useful type of rose for landscape planting. These shrubby roses are less ungainly than hybrid teas. The flowers are smaller than hybrid teas, often brightly colored and produced in clusters. Fragrance is light or lacking entirely. These are repeat-flowering.
Climbing roses and ramblers produce long canes that can be tied or trained on a support. Some roses have been bred to climb while others are vigorous mutations of bush roses. Ramblers and many climbers are once-blooming, but some climbers are repeat-flowering, so check before purchasing.
Landscape rose is a catchall name for roses that tend to be bushy and are useful for landscape planting. This category includes English roses, ground cover roses, landscape roses, shrub roses, hedge roses and others. Currently, the Knock Out rose and its several color forms are a popular part of this category. The Drift roses come in a variety of colors and are excellent low-growing landscape roses. These are repeat-flowering.
Old garden roses — Types developed before 1867.
The term “old garden rose” is a catchall term used for many distinctly different categories, and some grow better in Louisiana than others. The following are just a few of the many categories.
China roses are derived from Rosa chinensis, the first repeat-blooming rose discovered. (All repeat-flowering roses likely have R. chinensis in their breeding.) The abundant flowers are not highly scented and have thin, delicate petals. The foliage is neat, dark green, pointed and rarely bothered by black spot. These roses have a bushy, twiggy growth habit that fits in well with landscape planting. These are repeat-flowering.
Tea roses are wonderful roses for Louisiana and produce relatively large flowers in pastel shades and light reds. The fragrant flowers are produced continuously on robust bushes that are rugged and disease-resistant. These are repeat-flowering.
Noisette roses are mostly climbers, although a few are robust shrubs. These roses thrive in the Deep South. The pastel-colored flowers are fragrant and produced in clusters that hang down from the canes. These are repeat-flowering.
Bourbon roses are more susceptible to black spot than the old garden roses, but many of the Bourbons will thrive in our climate. The flowers are usually quite fragrant and produced on large, robust shrubs. Many are repeat-flowering.
On another note: Don’t forget that late January through mid-February is when we do major pruning to repeat-flowering types of roses in our landscapes. Most roses need at least some annual pruning to maintain an attractive shape, remove dead wood and encourage vigorous growth and blooming. If you don’t prune, the result will often be tall, rangy, overgrown bushes that will not be nearly as attractive. It is far easier for you and healthier for the rose bush if you do this pruning annually.
Use sharp bypass-type hand pruners that make clean cuts and minimize damage to the stems. Wear a sturdy pair of leather gloves and long sleeves. Should you need to cut canes larger than one-half inch in diameter, you should use loppers.
Don’t forget that we also do a second annual pruning in late summer, around late August or early September.
A Dorothy Perkins rambler rose spills over a brick wall. Photo by Dan Gill/LSU AgCenter
Europeana floribunda rose has several blooms on a single stem. Photo by Dan Gill/LSU AgCenter
China roses, like this Butterfly Rose, are repeat-flowering roses with a bushy, twiggy growth habit that fits in well with landscape planting. Photo by Dan Gill/LSU AgCenter