How much sun does Little Ironweed need?

Little Ironweed grows best in full sun conditions.

When does Little Ironweed bloom?

Little Ironweed blooms in May, June, July, August, September, and October.

What pollinators does Little Ironweed attract?

Little Ironweed draws bees, butterflies, and moths.

Is Little Ironweed HOA-friendly?

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

Little Ironweed

Name: Pollinator Patch
Author: Pollinator Patch

Cyanthillium cinereum

Last reviewed: August 2026

Toxicity unknown

Little Ironweed (Cyanthillium cinereum) 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

medium

Size

12"–36" H × 12"–24" W

Bloom

May, Jun, Jul, Aug, Sep, Oct

Pollinators

bees, butterflies, moths

Native alternatives to Little Ironweed

Little Ironweed is not native to the United States. These natives fill a similar role in a planting, matched on bloom season, bloom color and mature size.

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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.

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Little ironweed is a compact native perennial that produces clusters of small purple flowers from late spring through fall. This low-growing wildflower forms neat clumps and provides reliable color in sunny gardens with moderate water needs.

In an HOA neighborhood

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

Works well in: backyard only.

Common name includes 'weed' which creates negative perception
May appear too wild or informal for typical HOA standards
Growth habit could be seen as unstructured

Wildlife value

The long blooming period makes this an excellent nectar source for bees, butterflies, and moths throughout the growing season. Native pollinators particularly value the small but abundant purple flower clusters.

Common questions

How much sun does Little Ironweed need?: Little Ironweed grows best in full sun conditions.
When does Little Ironweed bloom?: Little Ironweed blooms in May, June, July, August, September, and October.
What pollinators does Little Ironweed attract?: Little Ironweed draws bees, butterflies, and moths.
Is Little Ironweed HOA-friendly?: Little Ironweed takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

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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