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Perennial Ragweed, Western Ragweed, Cuman Ragweed

Ambrosiapsilostachya

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Family

Asteraceae (ass-ter-AY-see-ee)

Info

Genus

Ambrosia (am-BRO-zhuh)

Info

Species

psilostachya (sil-oh-STAK-yuh)

Info

Synonym

Ambrosia californica

Ambrosia coronopifolia

Ambrosia cumanensis

Ambrosia rugelii

Sun Exposure

Full Sun

Foliage

Herbaceous

Height

12-18 in. (30-45 cm)

18-24 in. (45-60 cm)

24-36 in. (60-90 cm)

36-48 in. (90-120 cm)

Spacing

12-15 in. (30-38 cm)

15-18 in. (38-45 cm)

18-24 in. (45-60 cm)

24-36 in. (60-90 cm)

Hardiness

USDA Zone 6a: to -23.3 °C (-10 °F)

USDA Zone 6b: to -20.5 °C (-5 °F)

USDA Zone 7a: to -17.7 °C (0 °F)

USDA Zone 7b: to -14.9 °C (5 °F)

USDA Zone 8a: to -12.2 °C (10 °F)

USDA Zone 8b: to -9.4 °C (15 °F)

USDA Zone 9a: to -6.6 °C (20 °F)

USDA Zone 9b: to -3.8 °C (25 °F)

USDA Zone 10a: to -1.1 °C (30 °F)

USDA Zone 10b: to 1.7 °C (35 °F)

Danger

Pollen may cause allergic reaction

Bloom Color

Bright Yellow

Inconspicuous/none

Bloom Time

Mid Summer

Late Summer/Early Fall

Mid Fall

Other Details

Gardener's Notes:

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smiln32

Oklahoma City, OK (Zone 7a) | November 2004 | neutral

This plant spreads from rhizomes and is a perennial. It produces a fruit, called a bur, that is greenish-brown and has spines. It can b...Read More

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Perennial Ragweed, Western Ragweed, Cuman Ragweed

Ambrosiapsilostachya

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