Come! Ms. Dunlap will give two talks at the CNPS Conservation Conference Feb. 1-3 in LA!

One regarding a database of 3,700 nectar plants (& how to collect images to benefit pollinators), and the other regarding
a prototypical key incorporating a novel plant identification system that produced an order of magnitude improvement.

Ageratina occidentalis

Family: Celastraceae

Common name: SPINDLE TREE

Synonym: Euonymus occidentalis

Native to: Southern California


Type: perennial

Forms: clumping, erect

Max height: 3.3 feet

Max width: 3.3 feet


blue/green, yellow




Attracts wildlife: adult butterfly, specific butterfly species

Exposure: light shade, sun

Propagates by: seed

flowers in spring

flowers in summer

Soil type: well drained

USDA Zones: zone 5 to -20 f, zone 6 to -10 f, zone 7 to 0 f, zone 8 to +10 f, zone 9 to +20 f

Temp. range: -20 to +30 °F

Water: moderate, regular

Butterflies that feed on this plant

Ageratina, a genus containing 337 species, is a member of the Celastraceae family. Ageratina occidentalis, WESTERN SNAKEROOT or SPINDLE TREE, is a native wildflower that grows in the western portion of the United States, especially in southern California. It propagates by seed, grows to 3½ feet tall, and prefers moderate to regular watering.

Ageratina altissima tolerates dry conditions. It grows from seed to 6½ feet tall and prefers light shade. It is native to eastern North America.

WESTERN SNAKEROOT may be offered for sale by Yerba Buena Nursery dot com.
Calphotos dot berkeley dot edu have several images of this plant in habitat - browse through the genus page to view several images of this plant.

Blossoms of Ageratina attract the MONARCH to feed.