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.
Coleus can be started from seed, cuttings, transplants or potted plants purchased from the nursery. Just give them the basics and watch them take root. This is a plant that just wants to grow. Provide it with enough light, decent soil and enough water, and it's going to grow quickly, says Silk.