Cassytha pubescens (Downy Dodder-laurel)

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Cassytha spp.

dodder-laurel

Lauraceae Australia and pantropical regions

Attracts Pollinators Drought Tolerant

Native to North America

SunFull Sun – Part Shade

WaterLow · drought-tolerant

HardinessZones 9–11

Overview

Cassytha spp. is a genus of about twenty parasitic vines in the laurel family (Lauraceae), found mainly in Australia and across the tropics. Unlike most of the family, these are not trees but leafless, twining stems that scramble over other plants, looking much like the unrelated dodder (Cuscuta spp.). The thread-like stems are green to orange-yellow, 1-3 mm thick, and attach to host plants with small sucker-like pads called haustoria that tap into the host for water and nutrients. Leaves are reduced to tiny scales, and the stems carry out what photosynthesis the plant does for itself. Small white to cream flowers cluster along the stems, followed by fleshy berry-like fruit that birds eat and spread. The genus spreads over shrubs and trees in heath, coastal scrub, and open woodland, sometimes covering host plants in a tangled mat. Heavy infestations weaken or smother the host, so Cassytha spp. is regarded as a pest where it builds up. Because it lives as a parasite, it is not grown as a garden plant and cannot be cultivated apart from suitable hosts.

Native Range

The genus is centred on Australia, where most species occur, and extends through tropical Asia, Africa, the Pacific, and the Americas. Cassytha filiformis is the most widespread, reaching tropical coasts worldwide, including Florida and the Caribbean. The vines grow over shrubs and small trees in heath, dune scrub, and open woodland.

Suggested Uses

The genus has no garden use and is not planted, living instead as a wild parasite on other plants. Some species bear fruit that has been eaten by Aboriginal Australians and is taken by birds. In natural areas the vines form part of the local ecology despite their drain on host plants.

How to Identify

Look for a tangle of thin, leafless, twining stems, green to yellow or orange, draped over shrubs and low trees. Small pad-like attachments grip the host along the stems, and the plant has no true leaves, only minute scales. Tiny whitish flowers and small round fleshy fruits sit directly along the stems, separating it from the similar but unrelated dodder.

Appearance

Size & Dimensions

Height3' - 20'

Width/Spread3' - 10'

Reaches mature size in approximately 1 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~10 weeks

Summer

Flowering can occur through much of the warm season, with a peak in summer in temperate parts of the range and year-round flushes in the tropics. The small flowers are clustered tightly along the stems. Round fleshy fruits follow and ripen to white, green, or black, drawing fruit-eating birds.

Detailed Descriptions

Flower Description

white to cream

Foliage Description

green to yellow-green

Growing Conditions

Sun Requirements

SunFull Sun SunPartial Shade

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

pH Range5.0 - 7.5(Neutral)

357912

Soil Types

sand loam

Drainagewell drained

Water & Climate

Water Needs

Low

Frost Tolerance

tender

Time to Maturity

annual to short-lived

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

As a parasite, Cassytha spp. draws its water and much of its nourishment from host plants rather than from soil, so ordinary garden care does not apply. In the wild the vines grow wherever suitable woody hosts occur on sandy or rocky ground in warm climates. Plants are killed by hard frost and are limited to mild and tropical regions. Where the genus becomes a pest, the stems are pulled or cut from infested host plants to ease the smothering, though pieces can re-root onto new hosts. No fertilising, watering, or pruning regime is used, since the plant is not cultivated. Birds readily spread the seed into new areas.

Pruning

Pruning applies only as control rather than cultivation. The stems are pulled or cut away from host shrubs and trees to reduce smothering, ideally before fruit sets. Removed stems are bagged and destroyed, since fragments can attach and grow onto fresh hosts.