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Plant Database
western ragweed

western ragweed

Ambrosia psilostachya

herbaceous☀️ full sun💧 low water Hardy: Zone 4aZone 9b

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Western ragweed is a native perennial wildflower with a tall, branching form that produces dense spikes of small, wind-pollinated flowers in late summer and fall. It thrives in dry, open areas and is commonly found in prairies and disturbed areas across the western and central United States.

Overview

Form
Upright
Growth Rate
fast
Size
1.5–4′ tall × 1–3′ wide
Dormancy
deciduous
Family
Asteraceae

Native to the United States

Native Range

Western and central North America

Native to: Montana, Wyoming, Colorado, New Mexico, Arizona, Utah, Nevada, Idaho, Oregon, California, North Dakota, South Dakota, Nebraska, Kansas, Oklahoma, Texas, Minnesota, Iowa, Missouri, Arkansas

Seasonality

Bloom Season

J
F
M
A
M
J
J
A
S
O
N
D

Season of Interest

SummerFall

Companion Planting

Plants well with