Tiarella
Tiarella, commonly known as foamflower, is a genus of herbaceous perennial plants in the family Saxifragaceae. Native primarily to North America, with one species native to Asia, Tiarella species are prized for their attractive foliage, delicate flowers, and shade tolerance, making them popular choices for woodland gardens and ground cover.
Description:
Tiarella species typically form clumps of basal leaves, which can be lobed, dissected, or maple-leaf shaped, depending on the species and cultivar. Leaf textures range from smooth to slightly hairy, and leaf coloration can vary, often displaying patterns of green, bronze, or red, especially in cooler temperatures.
The flowers of Tiarella are small and star-shaped, typically white or pinkish, and borne on erect racemes or panicles above the foliage. The common name "foamflower" is derived from the mass of delicate flowers resembling foam. Flowering generally occurs in spring to early summer.
Cultivation and Uses:
Tiarella are relatively easy to grow in moist, well-drained soil in partial to full shade. They are valued for their ability to tolerate shade and their relatively low maintenance requirements. They are commonly used as ground cover, in woodland gardens, and in shady borders.
Numerous cultivars have been developed, offering a wide range of leaf shapes, colors, and flower forms. Some popular cultivars include those with deeply lobed or dissected leaves, as well as those with particularly showy flowers.
Tiarella are generally propagated by division in spring or fall. They can also be propagated by seed, although cultivars may not come true from seed. They are generally resistant to pests and diseases.
Species:
The genus Tiarella includes several species, including:
- Tiarella cordifolia (Heartleaf Foamflower)
- Tiarella polyphylla (Asian Foamflower)
- Tiarella trifoliata (Threeleaf Foamflower)
- Tiarella wherryi (Wherry's Foamflower)
These species and their cultivars offer a diverse range of options for gardeners seeking shade-tolerant plants with attractive foliage and delicate flowers.