Garden hybrid

This is a garden hybrid, bred from more than one wild species, so it has no single species page of its own.

299 other cultivars

perennial

Hosta Blue Mammoth

Q: What zones can Hosta Blue Mammoth grow in?

Hosta Blue Mammoth is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Q: Is Hosta Blue Mammoth deer resistant?

Not reliably. Deer may browse Hosta Blue Mammoth, especially tender spring growth — plan on repellents or fencing where pressure is high.

Q: When does Hosta Blue Mammoth bloom?

Hosta Blue Mammoth typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Q: Does Hosta Blue Mammoth need full sun?

Hosta Blue Mammoth does best in part shade.

Hosta x hybrida 'Blue Mammoth'

$16.00

The Story

Plant Bio

Hosta x hybrida 'Blue Mammoth' is a large, deciduous perennial with broad, heart-shaped leaves that display a striking bluish-green hue, and produces lavender-purple flowers on tall, arching scapes during summer.

This cultivar is renowned for its impressive size, vigorous growth, and its striking blue-green foliage that provides a bold statement in shaded garden areas.

Uses & Benefits:

Provides lush, evergreen foliage year-round, adding texture and color to shaded gardens.

Helps suppress weeds and retains soil moisture in shaded areas.

Supports pollinators with its early summer blooms.

Garden hybrid

Bred from more than one wild species, so it has no species page of its own.

Essentials

At a Glance

Plant Type

Perennial

Height

36 inches

Width

48 inches

Light

Partial Sun, Shade

Zones

4, 5, 6, 7, 8, 9

Water

Consistently moist

Humidity

Prefers moderate humidity

Lifespan

Perennial

Native To

Asia

Toxicity

Toxic to dogs, cats, and horses

Bloom period

Mid-summer – Late summer

In flower about 2 months of the year

Marketplace

Where to Buy

NH Hostas

<1 Gal Pot1+ Gal PotPlugs

In Stock$16.00

Shipping costs Year-round shipping Free shipping

Planting

How to Grow

Tuck hosta roots into well-draining soil
Water regularly to keep soil moist
Mulch around plant to retain moisture and suppress weeds
Fertilize with a balanced fertilizer in early spring
Divide every 3-4 years for healthy growth
Place in a shaded or partially shaded area

Pro Tip

Ensure soil remains consistently moist for optimal growth

Keep It Thriving

Care Guide

Do

Water deeply during dry spells 🌱
Mulch to conserve moisture and regulate temperature
Divide in early spring or fall

Don't

Avoid direct sunlight which can scorch leaves ❌
Over-fertilizing can cause floppy leaves
Don’t let soil dry out completely

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Fertilize
Mulch
Pest Check
Spring Cleanup
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Shaded woodland borderEvergreen backdrop with lush foliage

Companion Plants

Ferns Astilbe Hosta 'Sum and Substance'HeucheraJapanese painted fern

Multiply

Propagation Methods

Good to Know

Common Questions