After a hundred years of debate, the national flower of the United States passed the rose as the national flower in the House of Representatives on September 23rd with 1986. They believe that roses are the embodiment of love, peace, friendship, courage and dedication. Americans also believe that the red China rose symbolizes love, love and courage. Light pink conveys approval or praise, pink represents elegance and noble demeanor, dark pink expresses gratitude, white symbolizes purity, and yellow symbolizes celebration and happiness.
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Roses are masculine plants, which are rich in color and fragrance in sunny conditions. If the sunshine is less than 8 hours in the growing season, it will grow white without flowering. The requirement for air humidity is not strict, and rust and powdery mildew will occur at low temperature and high humidity; The flowering period requires the air to have a certain humidity; When drying at high temperature, the oil yield will decrease.
Roses do not require high pH value of soil, and can grow normally from slightly acidic soil to slightly alkaline soil. In winter, snow-covered areas can tolerate the low temperature of -38℃ to -40℃, and areas without snow can tolerate the low temperature of -25℃ to -30℃, but they can't tolerate the dry wind in early spring.
In areas with unfrozen soil and windy ground, branches are often blown dry by the wind; If the soil has been thawed and the roots continuously transport water and nutrients to the stems, the wind will not cause serious damage. Areas with dryness greater than 4 need irrigation conditions to develop normally.
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