Rosa 'KORbatam'

Summary

Winter Sun™ is a hybrid tea rose with fragrant, cream yellow flowers and an upright form characteristic of this class of roses.  Just coming into bloom during the Spring Open House, participants admired the “big pale yellow” blooms with “a tinge of pink,” and a “nice scent.” Trials staff did not deadhead the plants, and Winter Sun proved to be a prolific hip producer, either adding to or detracting from the appearance ratings depending upon individual preference. Open house participants generally disapproved of the green hips in the summer, while appreciating them once they changed to warmer yellow or orange in the fall. Flowers on Winter Sun™ do fade with age, and personal preferences of the open house raters ranged from “interesting color change,” to “unattractive, insipid white” blooms.

Foliage quality began to decline early in the summer with thrips and aphid feeding especially heavy on this cultivar (Table 14a). One Fall Open House participant commented that “the leaves would have rated higher if not so ‘gleaming’ with honeydew.” Plants had very good Overall Appearance ratings early on then fell to acceptable/average by mid-summer due to this pest pressure and a tendency for individual plants to have non-uniform (lop-sided) growth. Unlike true shrub roses, this hybrid tea really declined in its performance as a landscape placeholder by the middle of September. Growth measurements and aesthetic ratings data indicated performance was consistent across all treatments leading us to recommend irrigating this rose cultivar according to the Low category of WUCOLS.

Growth and Quality Data

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