Easily grown in average, medium, well-drained soil in part shade. Prefers moist, organically rich, acidic soils. Soil must not be allowed to dry out. A biennial or short-lived perennial which may be grown from seed sown directly in the garden in spring after threat of frost has passed for flowering the following year. Only a basal rosette of leaves is produced in the first year from seed. This rosette overwinters as evergreen foliage, with slender flower spikes rising from the rosette in the following spring for bloom in late spring to early summer. Removal of flower spikes after bloom will encourage a secondary bloom. Cut all flowering stalks back to basal foliage before seed sets in order to encourage plants to act as perennials. If flower spikes are left in place after flowering and allowed to go to seed, plants will act more as biennials and will, in optimum growing conditions, freely self-seed. However the spent flower spikes can rapidly become quite unsightly as the seed develops and many gardeners choose to remove most spikes and leave only a few for self-seeding. As with other biennials/short-lived perennials such as hollyhocks, these plants can remain in the garden for many years through self-seeding as if they were long-lived perennials, often establishing large colonies in optimum growing conditions.
Digitalis purpurea is a biennial foxglove that produces only a basal rosette of light green, oblong leaves in the first year from seed. Flowers are borne in the second year in terminal, one-sided racemes atop leafy, 2-4' tall (infrequently to 5') spires arising from the centers of the basal rosettes. Pendulous, 2-3" long, tubular, funnel-shaped, dark rose-pink to purple (sometimes white) flowers with purple and white spots inside are closely grouped along each spike. Flowers are attractive to hummingbirds. Plant leaves are a source of the drug digitalis and are highly poisonous. A late spring bloomer that reaches its peak about the same time as roses begin to bloom. After flowering, plants can become somewhat scraggly by late summer, and, because they are biennials, consideration may be given to removing them from the garden as soon as they release their seed. Individual flowers resemble the snipped off fingers of a glove, hence the common name of foxglove.