With a little planning, it is possible to have roses blooming in your garden from early June right up until the first frost. Rose bushes have either a one-time bloom, twice-a-year repeat bloom, or continuous bloom. Different classifications of roses have different bloom times. Plant them in full sun with well-drained soil for best results.
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Hybrid Tea Rose
The hybrid tea produces large, elegant, single blooms on long cutting stems. The flowers appear continuously from June until frost and have longevity and value as a cut flower. The hybrid tea is the rose used most often for exhibition. Hybrid tea plants often have sparse leaves and lanky stems up to 6 feet in height. They are best placed as a background plant in the garden.
Home gardeners have found a place for repeat bloom miniature roses in the last decade. Several species are noted as both outdoor landscape plants and container specimens.The plants range in height from 3 to 12 inches, with ½- to 1-inch single, double, and semi-double flowers in every colour. Because of the amount of light required for repeated bloom they usually perform best when planted outdoors. Potted miniature roses are easily moved to take advantage of the sunlight and from outdoors to indoors when frost threatens.
The word "floribunda" means "abundance" of flowers. Floribundas roses re-bloom in a wide range of bright colours. Floribundas grow to about 4 feet in height and are bushier than hybrid teas. The flowers are smaller and arranged in many clusters for a profusion of continuous colour. They have little, if any, fragrance but are chosen for their dependable display in the landscape.
Grandiflora roses are a cross between the hybrid tea and floribunda, producing large showy blooms in clustered form on long stems. They are hardy, continuous bloomers. The plants grow up to 7 feet tall, and are better suited to border backgrounds than as a specimen plant.
Climbing roses originated by crossing genus roses with numerous other cultivars. Unlike true climbers, which have tendrils for clinging to a support, the climbing rose sends out long thorny canes that the gardener trains over an arbor or trellis. Because of the wide genetic blend, these roses have variable traits. Some are single bloomers, while others bloom continuously. Some have large blooms, similar to hybrid tea, while others bloom in small clusters like the floribundas.
Polyantha rose bushes display flushes of blooms continuously right up until the threat of frost. Polyantha roses are small, compact plants ranging from 1 to 3 feet in height and width. They produce large, dense clusters of small flowers and are used in containers, mixed borders and in small spaces. Most are fragrant and hardy to zone 6.
A shrub rose is any rose not previously cited. Shrub roses tend to be the hardiest, most dependable bloomers, the easiest to maintain and the most fragrant. They are chosen by gardeners not only for their bloom, but for their foliage, rose hips and plant structure. Included in this group are over 100 varieties of English roses which combine the form and fragrances of old roses with the repeat-flowering of modern varieties. Most shrub roses are repeat bloomers, with good disease and insect resistance.
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- University of Minnesota Extension: Roses for the North -- Bloom Pattern
- Colorado State University; Selecting and Planting Roses; A.W. Nelson, et al; May 2006
- Clemson University Cooperative Extension; Growing Roses; Karen Russ; May, 2009
- Midwest Garden Tips: Selecting the Perfect Rose for Your Garden