How much water does Fremont cottonwood need?

This tree grows best in consistently moist soil and is commonly found along riverbanks, washes and floodplains. It tolerates high to medium water levels but declines during long dry spells.

When does Fremont cottonwood bloom?

It flowers in March, April and May, producing catkins before the leaves fully expand.

What pollinators visit Fremont cottonwood?

Bees and beetles have been observed visiting the catkins, though the tree also relies on wind for pollen movement and seed dispersal.

How big does Fremont cottonwood get and what growing conditions does it need?

It is a large deciduous tree, often 40 to 90 feet tall with a broad spreading canopy, and it needs full sun and reliable soil moisture to grow well.

Is Fremont's Cottonwood toxic to livestock?

The USDA PLANTS Database does not flag Fremont's Cottonwood as toxic to livestock.

Is Fremont's Cottonwood HOA-friendly?

Fremont's Cottonwood takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Fremont's Cottonwood

Name: Pollinator Patch
Author: Pollinator Patch

Populus fremontii

Last reviewed: September 2026

Fremont's Cottonwood is a fast growing deciduous tree that blooms from March through May and does best in full sun along streambanks, washes and other moist low-desert sites.

Toxicity unknown

Fremont's Cottonwood (Populus fremontii) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

The USDA PLANTS Database (opens in new tab) does not flag Fremont's Cottonwood as toxic to livestock.

Light

full sun

Water

high

Size

300"–600" H × 240"–480" W

Bloom

Mar, Apr, May

Native to

AZ, CA, ID, NM and 3 more states

Pollinators

bees, beetles

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Browse plants for this ecoregion

Coast Range Sierra Nevada Central California Foothills and Coastal Mountains Central California Valley Southern California Mountains Northwestern Forested Mountains Central Basin and Range Mojave Basin and Range North American Deserts Arizona/New Mexico Mountains Chihuahuan Deserts Madrean Archipelago Sonoran Basin and Range Southern California/Northern Baja Coast

Fremont's cottonwood is a fast-growing native tree that can reach 25-50 feet tall with a broad, spreading canopy. This deciduous tree produces catkins in spring and provides excellent shade, but requires consistent moisture to thrive. It's best suited for large properties with adequate space and water access.

Growing Fremont's Cottonwood

Grow Fremont's Cottonwood in full sun and high water. Mature plants reach 300 to 600 inches tall and spread 240 to 480 inches wide. Expect high maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

Fremont's Cottonwood takes more care to keep looking intentional in a front yard. Maintenance level: high. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Extremely large size inappropriate for most residential lots
High water requirements conflict with desert landscaping goals
Cottonwood fluff and leaf drop create maintenance issues

Wildlife value

Host plant for Western tiger swallowtail.

The spring catkins attract bees and beetles for pollination. The large canopy provides nesting sites for birds and the tree supports various native insects.

Common questions

How much water does Fremont cottonwood need?: This tree grows best in consistently moist soil and is commonly found along riverbanks, washes and floodplains. It tolerates high to medium water levels but declines during long dry spells.
When does Fremont cottonwood bloom?: It flowers in March, April and May, producing catkins before the leaves fully expand.
What pollinators visit Fremont cottonwood?: Bees and beetles have been observed visiting the catkins, though the tree also relies on wind for pollen movement and seed dispersal.
How big does Fremont cottonwood get and what growing conditions does it need?: It is a large deciduous tree, often 40 to 90 feet tall with a broad spreading canopy, and it needs full sun and reliable soil moisture to grow well.
Is Fremont's Cottonwood toxic to livestock?: The USDA PLANTS Database does not flag Fremont's Cottonwood as toxic to livestock.
Is Fremont's Cottonwood HOA-friendly?: Fremont's Cottonwood takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

See all plant problem guides

Ready to grow Fremont's Cottonwood? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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