Matthiola is a stock flower available from January to October in various colors like white, yellowish-cream, lavender, purple, and burgundy-wine. Stocks have a medium line flower and last 4-7 days, making them versatile for different floral designs. The document also defines hue as the primary dimension of color and discusses learning about color theory, meanings, warmth, and using complementary colors from a flower council website. It prompts completing work on color exercises.