Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light. When white light shines through a prism, the white light is broken apart into the colors of the visible light spectrum. Water vapor in the atmosphere can also break apart wavelengths creating a rainbow.
At maturity, the typical Blackeyed Susan (Hirta) will reach up to 1 foot high, with a maximum height at 20 years of 0 inches. The Blackeyed Susan (Hirta) is easily found in nurseries, garden stores and other plant dealers and distributors.
* Where to use: Grow up any sunny trellis or arbor or use black-eyed susan vines to add color to light posts, down spouts and radon pipes. (Erect netting or string to help them climb.) Or let them trail down from a hanging basket. * Care: Plant transplants or seed in mid-May after danger of frost. Unlike perennial black-eyed susan plants, these arenât cold-hardy. Work a granular, organic fertilizer formulated for flowers into the soil at planting and scatter a booster dose of the same over the soil surface 6 weeks later.