Plan the perfect garden with our interactive tool →

How Do Roses Get Their Color?

...
Hemera Technologies/AbleStock.com/Getty Images

Roses in the wild grow in reds, pinks, yellows and white. The dazzling color variations in a modern garden catalogue or florist shop have expanded the basics to include every color except blue. Rose color variations are achieved through genetics or environmental conditions. Selective or accidental breeding or the production of a sport on a rosebush may result in colors different from the parents, including variegations. Phototropic and thermotropic influences can result in interesting variations.

Selective Breeding

Cell sacs in the petals of roses contain pigments, which are capable of absorbing, transmitting and reflecting white light. Just as with a paint box, the mixing of colors produces somewhat predictable results. The introduction of wild yellow roses into selective breeding programs resulted in the first known orange roses around the turn of the 20th century. The concentration of pigments or the variation in the pH of the cell sap will affect the resulting color of the rose. Trace minerals can have an effect on rose colors, too. Rose breeders take all these factors into consideration when selectively breeding for color.

  • Roses in the wild grow in reds, pinks, yellows and white.
  • The concentration of pigments or the variation in the pH of the cell sap will affect the resulting color of the rose.

Accidental Breeding

Roses in the field are pollinated as are other plants, and desirably colored seedlings may result from these open crossings. William Baffin received its bright pink color from its parents as a result of open pollination. When an especially desirable rose color is observed from a chance seedling, breeders take very seriously the opportunity to test and develop the plant over several years to evaluate its eventual market worthiness.

Sports

A rose sport is a genetic mutation that occurs on the branch of a rosebush. This natural or environmentally induced event is unpredictable. Desirable sports are cloned and cultivated as possible candidates for market. Chicago Peace is a sport of the famous Peace rose. Found growing in Chicago, its bright, rich pink and orange coloration is much deeper and more intense than its parent. Autumn Sunset is a yellow rose resulting from a sport. It is similar in form to its orange parent, Westerland.

  • Roses in the field are pollinated as are other plants, and desirably colored seedlings may result from these open crossings.
  • When an especially desirable rose color is observed from a chance seedling, breeders take very seriously the opportunity to test and develop the plant over several years to evaluate its eventual market worthiness.

Phototropic and Thermotropic Influences

Light and temperature can greatly affect the color variations in some roses. Cooler temperatures enhance rose colors, with white or very light-colored roses taking on pink, apricot or yellow tones in cooler seasons. Heat washes out the color of some lighter varieties, resulting in pink or yellow roses fading to white or near white in the heat of mid-summer. The availability of sugars in the rose’s bud stage is affected by temperature and light, resulting in these environmentally induced variations in color. The hybrid tea Double Delight as is a white rose with cherry-red coloration in direct proportion to sunlight exposure. Some modern breeders, such as John and Robyn Sheldon, are actively pursuing these tendencies in their breeding program.

Related Articles

Meaning of Orange Roses
Meaning of Orange Roses
Names of Lavender Roses
Names of Lavender Roses
What is the Rarest Rose?
What is the Rarest Rose?
The Importance of Rose Flowers
The Importance of Rose Flowers
What Is a Knockout Rose?
What Is a Knockout Rose?
What Do Peach-Colored Roses Mean?
What Do Peach-Colored Roses Mean?
How to Freeze Roses
How to Freeze Roses
Different Types of Blue Rose Flowers
Different Types of Blue Rose Flowers
How to Identify a Rose Bush
How to Identify a Rose Bush
How to Dye White Roses Blue
How to Dye White Roses Blue
What Does it Mean When Rose Leaves Turn Red?
What Does it Mean When Rose Leaves Turn Red?
Roses Named After People
Roses Named After People
The Qualities & Attributes of the Rose Flower
The Qualities & Attributes of the Rose Flower
The Significance of the Yellow Tea Rose
The Significance of the Yellow Tea Rose
Uses of the Rose Flower
Uses of the Rose Flower
What Does the Blue Rose Represent?
What Does the Blue Rose Represent?
Scientific Names for Rose Flowers
Scientific Names for Rose Flowers
Garden Guides
×