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Cassytha filiformis

laurel dodder

Lauraceae

Pantropical coasts including northern and eastern Australia

Attracts Pollinators Drought Tolerant

Native to North America

SunFull Sun

WaterLow · drought-tolerant

HardinessZones 10–11

Overview

Cassytha filiformis is a parasitic, leafless climbing plant found across tropical and subtropical coasts worldwide, including northern and eastern Australia. It consists of slender, thread-like stems 0.02–0.06 inch (0.5–1.5 mm) thick, yellow-green to orange, that twine over and through other plants in tangled masses. The stems attach to host plants by small sucker-like outgrowths called haustoria, which draw water and nutrients from the host; the plant keeps some chlorophyll and is a partial parasite rather than a fully dependent one. Leaves are reduced to tiny scales. Small white flowers about 0.08 inch (2 mm) across appear in short spikes, followed by rounded, white, fleshy fruits 0.2–0.3 inch (5–7 mm) across. Cassytha filiformis grows mainly on coastal dunes, heath, and scrub, draped over shrubs and groundcovers. Heavy infestations can weaken or smother host plants. It spreads by seed, often carried by birds that eat the fruit, and by stem fragments that re-attach to new hosts.

Native Range

Found across tropical and subtropical coasts worldwide, including northern and eastern Australia, where it is native. It grows on coastal dunes, heath, and scrub, climbing over shrubs and groundcovers.

Suggested Uses

Cassytha filiformis is not planted in gardens and has no ornamental use. It is part of the natural coastal vegetation and is used in some regions in traditional medicine. In cultivated settings it is managed as a parasitic weed.

How to Identify

Recognized by tangled masses of slender, leafless, thread-like stems, yellow-green to orange, twining over other plants. Leaves are reduced to tiny scales, and small sucker-like haustoria attach the stems to host plants. Short spikes of small white flowers are followed by rounded white fleshy fruits 0.2–0.3 inch (5–7 mm) across.

Appearance

Size & Dimensions

Height3' - 10'

Width/Spread3' - 10'

Colors

Flower Colors

white

Foliage Colors

green

Fall Foliage Colors

no change

Bloom Information

Bloom Period

~12 weeks

Spring Summer

Flowering can occur over much of the year in warm climates, with a main flush in spring and summer. The small white flowers form in short spikes along the stems. Rounded white fruits follow and ripen over the following weeks.

Detailed Descriptions

Foliage Description

yellow-green to orange stems

Growing Conditions

Sun Requirements

SunFull Sun

Requires 6-10 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

Drainageaverage

Water & Climate

Water Needs

Low

Frost Tolerance

tender

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Cassytha filiformis is a parasitic plant that grows on living host plants rather than in soil, and it is not cultivated. It attaches to host shrubs and groundcovers by haustoria, drawing water and nutrients while keeping some of its own chlorophyll. It grows in warm coastal climates in full sun, spreading rapidly over suitable hosts. Heavy growth can weaken or kill the plants it climbs on. In managed gardens and bushland it is treated as a weed where it threatens valued plants, and is removed by stripping the stems before fruit sets.

Pruning

There is no routine pruning, as the plant is not grown deliberately. Where it smothers valued plants, the twining stems are stripped off and removed, ideally before the fruit ripens to limit spread. Removing infested host branches can help control heavy growth.