Poinsettia length. The colored bracts—which are most often flaming red but can be orange, pale green, cream, pink, white, or marbled—are often mistaken for flower petals because of their groupings and colors, but are actually leaves. The colors of the bracts are created through photoperiodism, meaning that they require darkness (12 hours at a time for at least five days in a row) to change color. At the same time, the plants require abundant light during the day for the brightest color. The flowers of the poinsettia are unassuming and do not attract pollinators. They are grouped within small yellow structures
Color garden first, such gardens were made popular by the work of famous garden designers such as Gertrude Jekyll and Vita Sackville-West. Sackville-West, for example, created what may have been one of the most famous single-color gardens, the Sissinghurst Castle's all-white garden. A white garden is a feature garden composed of plants that produce white flowers and spathes as well as plants with a white or silvery cast to their foliage. The white garden is a variant of the color garden. The most essential feature of the white garden is its unity of colour. The white garden is an informal gardening style