perennial

Swamp Lily

Crinum pedunculatum

The Story

Plant Bio

Crinum pedunculatum, the swamp lily, is a massive, evergreen bulbous perennial that forms a bold, fountain-like rosette of heavy, strap-shaped leaves. In summer, it produces robust, solid flower scapes topped with dense, highly fragrant clusters of white, spidery flowers featuring long, recurved petals and prominent pink or purple filaments.

This species is exceptionally versatile, thriving in waterlogged coastal soils and heavy clays where other bulbs rot, while maintaining high salt and wind tolerance. The thick, fleshy foliage emerges bright green from a stout, above-ground pseudostem that can reach up to eighteen inches in height.

Uses & Benefits:

Provides a dramatic, architectural focal point with its massive, fountain-like rosette of glossy green leaves and fragrant, spidery summer blooms.

Thrives in highly challenging, waterlogged, and saline coastal environments where other ornamental perennials fail.

Attracts nocturnal moths, butterflies, and general insect pollinators with its highly fragrant, night-scented white flowers.

Essentials

At a Glance

Plant Type

Perennial

Height

118"

Width

118"

Light

Full Sun, Partial Sun

Zones

9, 10

Water

High

Humidity

High

Lifespan

Perennial

Native To

Oceania and Australasia

Toxicity

Toxic to pets and humans

Bloom period

Summer – Autumn

In flower about 6 months of the year

Planting

How to Grow

Select a planting site in full sun to partial shade with moist loam, clay, or sandy soil.
Dig a hole twice the width of the bulb and plant with the neck of the bulb or pseudostem sitting just above the soil level.
Water deeply at planting and maintain consistent moisture until the root system is fully established.
Apply a thick layer of mulch in winter if growing near the northern limit of its hardiness range.

Pro Tip

Avoid dividing or moving established clumps, as crinums have sensitive root systems and flower far more reliably when left undisturbed and allowed to become completely root-bound.

Keep It Thriving

Care Guide

Do

Water regularly during hot dry spells to maintain lush, active foliage growth.
Trim away naturally yellowing lower leaves at the base to keep the rosette tidy.
Cut spent flower scapes cleanly at the base of the plant after blooming finishes.

Don't

Do not prune or cut back healthy green foliage, as this severely depletes the bulb's energy reserves.
Do not disturb the root zone of established clumps unless propagation is absolutely necessary.
Do not allow container-grown specimens to sit in stagnant, poorly aerated indoor potting media.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Pest Check
Propagate
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Rain gardensCoastal gardensBog gardensSpecimen plantingsLarge containers

Companion Plants

Canna indica Colocasia esculenta Iris virginica

Multiply

Propagation Methods

Good to Know

Common Questions

Swamp Lily questions

What zones can Swamp Lily grow in?

Swamp Lily is hardy in USDA Zones 9–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Swamp Lily deer resistant?

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

When does Swamp Lily bloom?

Swamp Lily typically blooms in summer through autumn. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Swamp Lily need full sun?

Swamp Lily does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Swamp Lily drought tolerant?

Yes — once established (usually after the first full season), Swamp Lily handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.