How much sun does Coastal ragweed need?

Coastal ragweed grows best in full sun conditions.

When does Coastal ragweed bloom?

Coastal ragweed blooms in May, June, July, August, September, and October.

Where is Coastal ragweed native?

Coastal ragweed (Ambrosia hispida) is native to FL, per the World Checklist of Vascular Plants (Kew).

Coastal ragweed

Name: Pollinator Patch
Author: Pollinator Patch

Ambrosia hispida

Last reviewed: November 2026

Coastal ragweed (Ambrosia hispida) is a perennial shrub native to FL. It blooms in May, June, July, August, September, and October.

Watering reminders and freeze alerts for Coastal ragweed, free in the app.

Toxicity unknown

Coastal ragweed (Ambrosia hispida) 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

low

Size

4"–12" H × 24"–60" W

Bloom

May, Jun, Jul, Aug, Sep, Oct

Native to

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Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 461 programs across 44 states, each with a link to the provider and the date we last checked it.

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Browse plants for this ecoregion

Southern Coastal Plain Southern Florida Coastal Plain

A low, mat-forming subshrub with finely divided, silvery-green leaves that spreads by runners across sandy dunes. Flowers are small, greenish, and wind-pollinated rather than showy, so it reads as a groundcover rather than a bloom feature.

Growing Coastal ragweed

Grow Coastal ragweed in full sun and low water. Mature plants reach 4 to 12 inches tall and spread 24 to 60 inches wide.

Wildlife value

Its dense, sprawling mat stabilizes loose sand and provides ground cover for small dune wildlife; the pollen is wind-dispersed rather than insect-collected.

Common questions

How much sun does Coastal ragweed need?: Coastal ragweed grows best in full sun conditions.
When does Coastal ragweed bloom?: Coastal ragweed blooms in May, June, July, August, September, and October.
Where is Coastal ragweed native?: Coastal ragweed (Ambrosia hispida) is native to FL, per the World Checklist of Vascular Plants (Kew).

Native range data from the World Checklist of Vascular Plants (Kew). 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.

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Ready to grow Coastal ragweed? Add it to your garden in the Pollinator Patch App to track it and get season-by-season care guidance.

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