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.
Grow them in water (optional). Most coleus cuttings will grow in a glass of water. Change the water every other day, keep the plant in bright, indirect sunlight, and transplant the coleus to a pot once you notice root growth.The soil method below works just as well.o take a coleus cutting, choose a branch without a bloom or bud at the tip. Cut directly below a leaf node, so the cutting is 4â6 in. (10â15 cm) long. Cuttings are also available for purchase directly, and typically come with a small root ball already developed.