Digitalis is a genus of about 20 species of herbaceous perennial plants, shrubs, and biennials, commonly called foxgloves. Foxglove flowers are clusters of tubular- shaped blooms in colors of white, lavender, yellow, pink, red, and purple. Foxglove plants grow best in rich, well-draining soil. The flowers may be purple, yellow, or white and are often marked with spots within. Foxgloves typically grow to a height of 45 to 150 cm (18 to 60 inches). They produce alternating, ovate to oblong leaves toward the lower part of the stem, which is capped by a tall, one-sided cluster of pendulous, bell-shaped flowers, each of which may be up to 6.5 cm (2.5 inches) long.