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.
Solenostemon scutellarioides can be trained into standards, although a coleus popsicle is not for me. However, for a formal garden, standards would be a lovely addition. Coleus is handsome in hanging baskets or as a foliage plant in a mixed container. I grew one cultivar as a colorful low hedge in Hawaii.