The colors that are seen when sunlight is split by a prism are sometimes called the spectral colors. These are red, orange, yellow, green, blue, indigo, and violet. These ROYGBIV colors are often reduced to three red, green, and blue-violet which are the primary colors for the additive color system (light).
Growing coleus from seed. Coleus seedlings are abundant with varying shades of color from the moment they pop through the earth. Their vibrant colors are intensified when grown under fluorescent lights. An abundance of light is a must if you propagate coleus indoors in January.
Although coleus does flower, it is grown for its brightly colored leaves (Fig. 1). The plant grows in sun to partial shade and requires a lot of water. Coleus reaches 20 to 24 inches tall but trailing types can be used in hanging pots.