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.
Growing Coleus from Cuttings. 1  1. Take cuttings from adult plants, or purchase them. 2  2. Remove the leaves. 3  3. Dip the cut end in rooting hormone (optional). 4  4. Grow them in water (optional).  5. Plant the cuttings in moist 1  soil. 6. Cover young cuttings with a plastic 2  bag. 7. Keep in a warm room with indirect  sun.