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 are members of the Mint family (Lamiaceae), and have the characteristic square stems and opposite leaves of that group of plants. Coleus do not have the invasive growth habit of the herb Mint and are well-behaved in the garden. Some Coleus grow in an upright form, some grow in a mounding form, and some creep or trail. The leaves can be narrow or wide, round or ovate, and come in a wide range of interesting shapes and fancy leaf edges.