Garden hybrid

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

298 other cultivars

perennial

Hosta Sea Monster

Hosta x hybrida 'Sea Monster'

The Story

Plant Bio

Hosta x hybrida 'Sea Monster' is a vigorous perennial known for its large, broad leaves with a rippled margin, producing tall flower spikes with lavender to purple flowers in summer.

This cultivar is distinguished by its exceptionally large foliage and dramatic, textured appearance, making it a striking focal point in shaded garden areas.

Uses & Benefits:

Provides lush foliage and texture, thriving in shaded gardens.

Low maintenance, deer resistant, drought tolerant once established.

Supports local pollinators and improves soil health.

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

28 inches

Width

60 inches

Light

Partial Sun, Shade

Zones

4, 5, 6, 7, 8, 9

Water

Moderate

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

Planting

How to Grow

Select a shaded spot with well-draining soil.
Tuck seeds or divisions into the soil with roots facing down.
Water thoroughly after planting, keep soil moist.
Mist cuttings regularly to maintain humidity, if propagating via cuttings.
Mulch around the base to retain moisture and suppress weeds.
Divide plants in early spring or late fall every 3-4 years to promote growth.

Pro Tip

Plant in rich, moist soil in shaded areas for best results.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil moist 🌱
Apply mulch to conserve moisture
Divide every 3-4 years for vigorous growth
Use organic fertilizer in early spring

Don't

Avoid full sun exposure ❌
Don't let soil dry out completely
Avoid heavy, waterlogged soil
Refrain from over-fertilizing

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Shaded woodland borderSilver-foliaged hedgeVanilla-scented border

Companion Plants

Ferns AstilbeJapanese forest grass Heuchera Ligularia

Multiply

Propagation Methods

Good to Know

Common Questions

Hosta Sea Monster questions

What zones can Hosta Sea Monster grow in?

Hosta Sea Monster 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.

Is Hosta Sea Monster deer resistant?

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

When does Hosta Sea Monster bloom?

Hosta Sea Monster 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.

Does Hosta Sea Monster need full sun?

Hosta Sea Monster does best in part shade.