1. Pink roses can turn blue. The blue rose is also called the "blue enchantress". It is a newly cultivated transgenic variety.
2. Chromosome: The change from pink roses to blue roses is a chromosomal variation.
3. Temperature: The anthocyanins and acids in petals will change their concentration with the temperature, and the temperature fluctuation in a day can affect the flower color.
4. Acidity and alkalinity: the acidity and alkalinity of the soil can also determine the color, generally acid blue alkali red, and the acidity and alkalinity of the soil can also determine the color, generally acid blue alkali red. The flowers on the same Hydrangea are different in color because of different opening hours.
5. Artificial color change: change the color in the growing period, before a little flower bud, mainly by adjusting the aluminum ion in the soil to control the pH, and bloom blue flowers: a. aluminum sulfate solution (aluminum sulfate and water=3:1000) can be poured about three times a month; b、 Solid aluminum powder, 2-3g each time, is sprinkled in the basin soil twice a month.
6. Grafting: When roses of different colors and varieties are grafted together, different flowers can be produced.
7. Illumination: The color change of roses is mostly due to the light. The strong light of yellow roses will turn red, and the green roses will gradually turn white, or pink edges will appear.