Hosta 'Blue Mammoth'

'Blue Mammoth' Hosta

Hosta ‘Blue Mammoth’ — commonly known as Blue Mammoth Hosta — is a giant perennial prized for its enormous blue-gray leaves that form a broad, commanding mound in shaded gardens. The thick, heavily textured foliage emerges with a strong blue cast and develops deep corrugation as it matures, creating dramatic architectural presence. Pale lavender to nearly white flowers rise above the foliage in midsummer on tall sturdy scapes.

Type: Herbaceous perennial

Mature Size:
Width: 5–6 ft
Height: 3–4 ft

USDA Zones: 3a–8b

Form: Giant, broad mounded clump

Light: Partial shade to full shade

Soil: Rich, moist, well-drained soil with organic matter

Water: Moderate; prefers consistent moisture

Wildlife: Flowers attract hummingbirds and bees

Features & Landscape Uses: Excellent for woodland gardens, large shade borders, specimen planting, and massing where bold foliage scale is desired. Thick leaves provide strong slug resistance and exceptional texture.

Care: Maintain even soil moisture during dry periods to preserve blue coloration and leaf quality. Divide only when necessary, as mature clumps improve with age. Remove spent flower stalks after bloom. 🌿💙

Plant type

Perennial

Height

3-4'

Width

5-6'

Hardiness zones

3–9

Sunlight

Full Shade, Partial Shade

Growth rate

Moderate

Bloom time

Mid Summer

Flower color

White

Attracts

Bees, Hummingbirds

Soil

Moist well-drained, Rich

Landscape use

Border, Container, Mass Planting, Rock Garden

Shape

Clump, Mounded

Drought tolerant

No