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 is very durable, so you can cut your plant back severely if needed (almost back to the soil level). Coleus should be kept at a 15-20Â°C (60-70Â°F) over winter. They will survive down to 10Â°C (50Â°F) but only if kept dry. Losses to rot and fungal diseases are high if the plants are allowed to get cold and damp.