Clump Forming Perennials

Written by callie barber
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Clump Forming Perennials
Hellebore plants enhance the garden with their vibrant colours. (hellebore image by hazel proudlove from

Enhance areas of the landscape with clump forming perennials. Grown in a wide range of shapes, sizes and bloom colours, perennial flowers have a one-time planting to grow back year after year fuller than before. Their clumping habit makes them ideal grown in masses along a border or bed or used as a ground over or edging for the garden.

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Hellebore (Helleborus 'Winter Joy Bouquet') is a clump forming evergreen perennial plant that grows up to 1-1/2 feet tall and wide. It features 2-inch-wide, cup-shaped blooms that grow in a wide range of colours including, white, pink, dark red and creamy yellow. Hellebore produces glossy, dark green foliage that is deeply-cut and divided into narrow, toothed segments. The evergreen foliage on hellebore is lance to elliptic in shape and, as an evergreen, retains its colour year-round. Hellebore grows best in light to moderate shade and well-drained, organically rich soil. Grow hellebore in USDA Plant Hardiness Zones 4 to 9.

Giant Snowdrop

Giant snowdrop (Galanthus elwesii) is a winter-blooming perennial flower with a clumping growth habit. It grows less than 6 inches tall and wide and features white, nodding blooms that appear in late winter. The common name refers to the resemblance of the blooms to drops of snow. Hardy, giant snowdrops are frost tolerant and grow best in full sun to part shade and well-drained, moist soil. Grow giant snowdrop in USDA Plant Hardiness Zones 3 to 9.


Astilbe (Astilbe x arendsii 'Fanal') is a clump forming perennial that grows up to 1-1/2 feet tall and 1 one foot wide. It features tiny blooms that are "the darkest red flowers of any of the astilbes," according to Missouri Botanical Garden. The flowers on astilbe form the densely packed, erect to arching, plumelike flowers that appear to be rising out of the foliage on the upright stems. Astilbe produce fernlike mounds of foliage that are ovate- to lance-shaped and sharply toothed. Astilbe grows best in part to full shade and well-drained, moist soil that is humus-rich. Grow astilbe in USDA Plant Hardiness Zones 3 to 8.

Goat's Beard

Goat's beard (Aruncus dioicus) is a clump forming, bushy perennial plant that grows 4 to 6 feet tall and 2 to 4 feet wide. Goat's beard produces spikes of small, creamy coloured blooms that emerge in early to mid summer and above the foliage. It produces dark green, compound foliage that creates a showy display. Goat's beard grows best in full sun to part shade and well-drained, moist soil. Grow goat's beard in USDA Plant Hardiness Zones 4 to 8.

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