Viburnum opulus ‘Nanum’ (European Cranberrybush)

Viburnum opulus ‘Nanum’ is a non-flowering, non-fruiting dwarf cultivar of the European cranberry bush. This low-growing deciduous shrub is prized primarily for its dense, mounded habit and lobed, green leaves that provide textural interest. It is ideal for small spaces, rock gardens, or as a low hedge.

Viburnum opulus ‘Nanum’: An In-depth Look

Native: It’s a cultivar of Viburnum opulus, which is native to Europe, Asia, and northern Africa. However, the ‘Nanum’ variety is specifically cultivated for its dwarf characteristics.

Plant Type and Habit: This is a deciduous shrub with a mounded, compact habit. Its dense branching makes it ideal for use as a low hedge or ground cover.

Size: Typically, this shrub reaches a height of 2-3 feet (60-90 cm) and a spread of 2-4 feet (60-120 cm), making it significantly smaller than its parent species.

Flowers: While its parent species is known for its showy flowers, ‘Nanum’ rarely flowers.

Fruits: This is a non-fruiting cultivar.

Foliage: It has maple leaf-like, dark green leaves that turn greenish to reddish-purple in the fall, providing seasonal interest.

Hardiness: This shrub is hardy in USDA zones 3-8, making it adaptable to a variety of climates.

Uses: Its compact size and attractive foliage make it ideal for borders, ground covers, or container planting.

Invasiveness: Find where this species is invasive in the United States. Discover beautiful U.S. native plant alternatives.

Benefits: Its small size, resistance to pests, and multi-season interest make it a versatile choice for any garden. It’s also relatively low-maintenance.

How to Grow and Care for European Cranberrybush

Light: Prefers full sun to partial shade. A minimum of 4-6 hours of sunlight is ideal for healthy growth.

Soil: Thrives in well-drained, moderately fertile soil. It can tolerate a wide pH range.

Water: Requires regular watering, especially during dry spells. However, it is relatively drought-tolerant once established.

Fertilizer: Apply a balanced, slow-release fertilizer in early spring and again in late summer for optimal growth and foliage.

Pruning: Best pruned immediately after flowering to maintain shape. However, Viburnum opulus ‘Nanum’ typically requires less pruning due to its dwarf nature.

Propagation: Propagate by softwood cuttings in late spring or early summer. Semi-hardwood cuttings can also be used in late summer.

Pests and Diseases: No serious insect or disease issues. Keep an eye out for aphids, scale insects, thrips, or viburnum beetle. Occasional disease problems include leaf spot, root rot, and botrytis. Apply appropriate treatments as needed.