Phoradendron californicum (Mesquite Mistletoe)

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Phoradendron, Genus, californicum, Species,

Genus & species

mesquite mistletoe

Santalaceae

Sonoran and Mojave deserts of southwestern North America

Attracts Pollinators Attracts Butterflies Drought Tolerant

SunFull Sun

WaterVery Low · drought-tolerant

HardinessZones 8–11

Overview

Phoradendron californicum is an aerial hemiparasitic shrub in the sandalwood family that grows on the branches of desert legume trees. It forms dense, pendent clusters of jointed, reddish-green to brownish stems 1-3 feet (30-90 cm) long, hanging from the host canopy. The plant is nearly leafless, its leaves reduced to tiny scales at the stem joints, so photosynthesis occurs in the green stems while water and minerals are drawn from the host through a modified root called a haustorium. Minute flowers, under 0.1 inch (2-3 mm), appear along the stems in winter and are followed by translucent pink to whitish berries about 0.2 inch (4-5 mm) wide. The sticky berries are eaten by birds, especially the phainopepla, which spreads the seeds to new host branches. P. californicum parasitizes mesquite, palo verde, acacia, and ironwood across the Sonoran and Mojave deserts, drawing enough resources that heavy infestations weaken or kill host limbs over time. The berries and stems contain toxic compounds and are not safe to eat. Growth is slow and tied entirely to the health of the host tree.

Native Range

Phoradendron californicum is native to the deserts of the southwestern United States and northwestern Mexico, including the Sonoran and Mojave deserts of California, Arizona, Nevada, Baja California, and Sonora. It occurs wherever its desert legume hosts grow.

Suggested Uses

Phoradendron californicum is not planted ornamentally and is most often managed as a parasite of desert trees. It holds ecological value as a winter food source for birds and as a larval host for several hairstreak butterflies. Dried stems and berries are sometimes used in desert seasonal decorations.

How to Identify

Look for dense, hanging masses of jointed, reddish to olive-green leafless stems clustered on the branches of desert trees. The stems are brittle and segmented, with leaves reduced to tiny scales at each joint. Clusters of translucent pink to whitish berries 0.2 inch (4-5 mm) wide in winter separate it from the broader-leaved true mistletoes such as P. leucarpum.

Appearance

Size & Dimensions

Height1' - 3'

Width/Spread1' - 3'

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~8 weeks

Flowers: December–March

Winter

Tiny inconspicuous flowers appear in winter, roughly December to March, along the green stems. Pollination is by small insects drawn to the stems. Berries ripen from late winter into spring and persist on the plant for weeks.

Detailed Descriptions

Foliage Description

reddish-green

Growing Conditions

Sun Requirements

SunFull Sun

Requires 8-12 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

Water & Climate

Water Needs

Very Low

Frost Tolerance

tender

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Phoradendron californicum cannot be grown as a freestanding plant, since it depends on a living host tree for water and nutrients. In the wild it establishes when a bird deposits a sticky seed on a suitable host branch, where the seed germinates and sends a haustorium into the bark. It tolerates intense desert heat, full sun, and drought as long as the host survives. The parasite draws water and minerals from the host, so its vigor rises and falls with host health. Heavy infestation can reduce host growth and cause branch dieback. Removal in landscape trees is done by pruning out infested limbs well below the attachment point.

Pruning

In managed desert landscapes, infested host branches are pruned out 1 foot (30 cm) or more below each attachment to remove the embedded haustorium. Cutting only the visible stems leaves the root system in the bark, and the plant regrows. The mistletoe itself is not pruned for shape.