Grandiflora rose plant named ‘Radtriple’

Latin name of genus and species of plant claimed:

Variety denomination: ‘Radtriple’.

The new variety of Grandiflora rose plant of the present invention was created by controlled breeding in June 2015 in Greenfield, Wisconsin by artificial pollination wherein two parents were crossed which previously had been studied in the hope that they would contribute the desired characteristics. The female parent (i.e., the seed parent) was ‘RAD8613’ (not patented). The male parent (i.e., the pollen parent) of the new plant variety was ‘WEKcobeju’ (U.S. Plant Pat. No. 21,709).

The parentage of the new plant variety can be summarized as follows:‘RAD8613’ x ‘WEKcobeju’

The seeds resulting from the above pollination were sown and small plants were obtained which were physically and biologically different from each other. Selective study resulted in the identification of a single plant of the new variety.

The new plant variety has been found to undergo asexual propagation at Wasco, California and Cochranville, Pennsylvania by a number of routes such as vegetative cuttings. Asexual propagation techniques in Wasco, California and Cochranville, Pennsylvania, such as vegetative cuttings, have shown that the characteristics of the new plant variety are homogeneous, stable, and strictly transmissible by such asexual propagation from one generation to another. Accordingly, the new plant variety undergoes asexual propagation in a true-to-type manner.

It was found that the new variety of grandiflora rose plant of the present invention possesses the following combination of characteristics:

The new plant variety well meets the needs of the horticultural industry. It can be grown to advantage as distinctive ornamentation in parks, gardens, public areas, and residential landscapes. Accordingly, it is particularly well suited for growing in the landscape.

The new plant variety can be readily distinguished from its ancestors. More specifically, the new plant variety displays red-colored flowers and has a denser growth habit compared to the ‘RAD8613’ parent (i.e., the seed parent), which displays pale pink-white colored flowers. Additionally, the new plant variety displays red-colored flowers and forms more petals (about 30 to 35 petals per flower) compared to the ‘WEKcobeju’ parent (i.e., the pollen parent), which displays smoky lavender and rusty red-orange-colored blossoms and forms about 16 to 24 petals per flower. Moreover, the new plant variety can be readily distinguished from non-parental related similar varieties. For example, the new plant variety exhibits a very bushy and compact growth habit, typically provides between 1 and 6 blooms per stem, and exhibits a medium sweet fragrance, compared to ‘KORroleotu’ (U.S. Plant Pat. No. 30,142) which exhibits a very bushy and upright growth habit, typically provides one bloom per stem, and exhibits a very light sweet scent.

The new plant variety has been named ‘Radtriple’.

The chart used in the identification of colors is that of The Royal Horticultural Society (The R.H.S. Colour Chart, 2015 edition). The terminology which precedes reference to the chart has been added to indicate the corresponding color in more common terms and The R.H.S. Colour Chart designations used herein each represent the closest color observed on the majority of the specified botanical feature. The description is based on a two-year-old specimen of the new plant variety, observed during June, while growing on its own roots in a three-gallon container in Cochranville, Pennsylvania.

The new ‘Radtriple’ plant variety has not been observed under all possible environmental conditions to date. Accordingly, it is possible that the phenotypic expression may vary somewhat with changes in light intensity and duration, cultural practices, and other environmental conditions.