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A picture of a Crimson Flag Lily

Crimson Flag Lily

Hesperantha coccinea

Also known as

River Lily, Scarlet River Lily

Hesperantha coccinea-001 by (CC BY-SA 3.0)

Full Sun
Moderate care
Moderate watering
Frost Hardy


RHS hardiness


Minimum temperature

Expected size








3 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

This plant has a mild fragrance

More images of Crimson Flag Lily

Some red Hesperantha coccinea flowers in the wild
Some red flowers with green leaves of a Hesperantha coccinea plant
A pink flower on a plant
A photo of Crimson Flag Lily
A photo of Crimson Flag Lily

Crimson Flag Lily Overview

Hesperantha coccinea is a fast-growing, attractive marshland species that forms dense clumps if planted in a moist spot in the garden. Given a couple of years, it can create a spectacular display of crimson red, pink or white flowers in any garden. This species is low maintenance and has the ability to self-seed​. This plant can even be brought inside to be enjoyed after sunset.

How to harvest Crimson Flag Lily

Harvest beautiful flowers in mid summer months for floral arrangements.

How to propagate Crimson Flag Lily


Sow seeds during spring at a depth of 1 cm and space them 10 cm apart. Sow directly into the desired area in the garden or in seed trays with a well-drained potting mixture. Keep moist.


Divide the tubers any time from early summer until autumn and plant offsets to a depth of 1 cm and space them 10 cm apart.

Special features of Crimson Flag Lily

Attracts useful insects

This species attracts butterflies and flies.

Pot plant

This species is great for a pot as it can be moved to preferred areas. Can bring inside when in bloom. Can submerge the potted plant in water.

Wet sites

This species originates from marshland areas, making it an ideal plant to place in wet sites.

Attractive flowers

Attracts butterflies

Other uses of Crimson Flag Lily

Walls, rock garden, borders, flower arranging

Autumn Flowering Bulbs

Flowering in autumn these bulbs give a beautiful display.

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