Temperature may influence a rose to change its color of flower. Outside temperature may also change the color of a rose before it blooms. If a rose is diseased, it may cause it to change its color. One disease that effect the color variation of roses is called botrytis blight. A fungicide may be used to help eliminate this disease from spreading to other plants. Looking for signs of this disease early may help save the roses.
- Roses can change color it the rosebush was a grafted bush and the root stock takes over the bush.
- Temperature can affect the color of roses as well, cooler temps, more vibrant colors.
- There are several plant diseases also that can affect the color of your roses.
“While it may seem uncommon, color changing in roses actually happens more often than one would think…and for many different reasons. Determining the cause of your changing rose color is the first step to getting the plant back to its original hue.”
Read more: https://www.gardeningknowhow.com/ornamental/flowers/roses/why-roses-change-color.htm