How much sun does Tidalmarsh Amaranth need?

Tidalmarsh Amaranth grows best in full sun conditions.

When does Tidalmarsh Amaranth bloom?

Tidalmarsh Amaranth blooms in July, August, and September.

Where is Tidalmarsh Amaranth native?

Tidalmarsh Amaranth (Amaranthus cannabinus) is native to CT, DE, FL, GA and 11 more states, per vouchered herbarium specimen records and regional native plant society lists.

Is Tidalmarsh Amaranth HOA-friendly?

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

Tidalmarsh Amaranth

Name: Pollinator Patch
Author: Pollinator Patch

Amaranthus cannabinus

Last reviewed: August 2026

Toxicity unknown

Tidalmarsh Amaranth (Amaranthus cannabinus) 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.

Light

full sun

Water

high

Size

12"–48" H × 6"–24" W

Bloom

Jul, Aug, Sep

Native to

CT, DE, FL, GA and 11 more states

Before you buy

Your city may pay you to plant this

Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.

Find rebates in your area

Browse plants for this ecoregion

Northeastern Highlands Northeastern Coastal Zone Middle Atlantic Coastal Plain Northern Piedmont Southeastern Plains Ridge and Valley Southern Coastal Plain Atlantic Coastal Pine Barrens

Tidalmarsh amaranth is a tall annual wildflower that thrives in wet conditions and full sun. It produces clusters of small greenish flowers from July through September and can reach up to 4 feet in height. This native plant requires consistently moist to wet soil and may struggle in typical garden conditions.

In an HOA neighborhood

Tidalmarsh Amaranth takes more care to keep looking intentional in a front yard. Maintenance level: moderate. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Tall wild appearance looks unmanicured
Name association with cannabis may cause neighbor concerns
Dies back completely as annual leaving gaps

Wildlife value

This plant provides seeds for birds and serves as a host for various native insects. The flowers attract small pollinators and beneficial insects during the late summer blooming period.

Common questions

How much sun does Tidalmarsh Amaranth need?: Tidalmarsh Amaranth grows best in full sun conditions.
When does Tidalmarsh Amaranth bloom?: Tidalmarsh Amaranth blooms in July, August, and September.
Where is Tidalmarsh Amaranth native?: Tidalmarsh Amaranth (Amaranthus cannabinus) is native to CT, DE, FL, GA and 11 more states, per vouchered herbarium specimen records and regional native plant society lists.
Is Tidalmarsh Amaranth HOA-friendly?: Tidalmarsh Amaranth takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

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

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