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This herbaceous annual or dwarf shrub grows to 0.3–1 m (1 ft 0 in – 3 ft 3 in) high, with ovate to triangular leaves 2–7 cm (0.79–2.76 in) long, and blue flowerheads (sometimes white, pink, or purple). The flower heads are borne in dense corymbs. The ray flowers are threadlike and fluff-haired, leading to the common name.
The production of bedding plants has changed dramatically over the last 50 years. [14] [15] In the U.S. in 1970, cut flowers were the top sellers, by far. Bedding plant production was increasing, but slowly. As cut flower production moved off-shore, greenhouse operators began to expand into bedding plant production.
They cannot flower under short nights or if a pulse of artificial light is shone on the plant for several minutes during the night; they require a continuous period of darkness before floral development can begin. Natural nighttime light, such as moonlight or lightning, is not of sufficient brightness or duration to interrupt flowering. [1] [2]
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 color. 1912 painting by Henri Le Sidaner of a white garden at dusk
The difference between brightness and lightness is that the brightness is the intensity of the object independent of the light source. Lightness is the brightness of the object in respect to the light reflecting on it. This is important because the Helmholtz–Kohlrausch effect is a measure of the ratio between the two. [3]
Chroma is the "colorfulness of an area judged as a proportion of the brightness of a similarly illuminated area that appears white or highly transmitting". [3] [2] As a result, chroma is mostly only dependent on the spectral properties, and as such is seen to describe the object color. [4]
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