Variety traits

Rose flower diameter

Rosa L.

A key morphological characteristic of the rose used for varietal identification, assessment of commercial quality in breeding, and categorization of varieties by purpose.

In the reference 106 varieties crop Rose, where this is mentioned in the description.

According to the UPOV guidelines, the diameter is measured on a fully opened flower whose petals are carefully flattened horizontally for data accuracy. The value is recorded in centimeters and serves as a baseline parameter when creating a variety passport, with specific values varying significantly depending on the varietal group: from small in border and polyantha roses to large ones, reaching 15–16 cm, in hybrid teas.

In agronomy and breeding, this trait serves as a critical marker of commercial quality for cut flower varieties and a tool for classification. Since flower size can vary under the influence of agricultural practices, growing conditions, and plant age, it is always evaluated in conjunction with other characteristics, such as bud shape and growth type.

General information about the subject — on the page Flower diameter.

Sources8

Varieties of Rose mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.