[From The Practical Book of Outdoor Rose Growing, by George C. Thomas, p. 40-41:] Owing to the difference in our climate, even the color of imported roses may vary somewhat from the European catalogued description. The average rose is generally somewhat lighter in color, owing to our extreme heat in summer... In the early spring and in the autumn the color of most roses with us is darker than in the summer, some varieties that usually have a slight yellow tint becoming almost pink under frosty nights and warm days.