This genus is similar in appearance to the foxglove, but has larger flowers with more pronounced lobes and leaves with an irregular, toothed or lobed margin.
There are nine species, all perennial Chinese natives, but only two are common in cultivation and are often treated as biennials.
They grow best in part-shade, in humus-rich soil with good drainage. They struggle with harsh winter conditions, so in exposed areas are best grown as biennial or overwintered in a greenhouse.
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