When does false nettle bloom?

False nettle produces small greenish flower clusters from June through November, with timing varying somewhat by latitude and local growing conditions.

What growing conditions does false nettle need?

False nettle grows best in consistently moist to wet soil and tolerates full sun to fairly shaded sites, which is why it turns up in wet woods, floodplains, marsh edges and ditches.

Is false nettle useful for a butterfly garden?

Yes. False nettle serves as a larval host plant for Red Admiral butterflies, so leaving some foliage intact through the season supports their caterpillars.

Does false nettle need full sun to flower well?

No. It flowers reliably in full sun but also blooms in part sun or part shade, making it flexible for shadier wet spots in a garden or restoration planting.

Is Smallspike False Nettle toxic to livestock?

The USDA PLANTS Database does not flag Smallspike False Nettle as toxic to livestock.

Is Smallspike False Nettle HOA-friendly?

Smallspike False Nettle is generally an HOA-friendly choice in the right placement, with low maintenance.

Smallspike False Nettle

Name: Pollinator Patch
Author: Pollinator Patch

Boehmeria cylindrica

Last reviewed: October 2026

Boehmeria cylindrica, or false nettle, is a wetland forb that blooms from June through November along streambanks, wet meadows and swampy woods across much of the eastern and central United States.

Toxicity unknown

Smallspike False Nettle (Boehmeria cylindrica) 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 Smallspike False Nettle as toxic to livestock.

Light

full sun

Water

medium

Size

48"–60" H × 12"–24" W

Bloom

Jun, Jul, Aug, Sep, Oct, Nov

Native to

AL, AR, AZ, CT and 35 more states

Pollinators

butterflies

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False Nettle is a tall, upright native perennial that forms narrow clumps in sunny locations. Despite its name, it doesn't sting and produces small greenish flowers from summer through fall. The plant has a somewhat informal appearance and goes dormant in winter.

Growing Smallspike False Nettle

Grow Smallspike False Nettle in full sun and medium water. Mature plants reach 48 to 60 inches tall and spread 12 to 24 inches wide. Expect low maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

Smallspike False Nettle is an HOA-friendly choice. Maintenance level: low. Tidiness: 2 out of 5.

Works well in: mid zone.

May flop without support
Best in less formal zones

Wildlife value

This plant is particularly valuable for butterflies, serving as both a nectar source and host plant for several species. The long bloom period provides consistent pollinator support from summer through late fall.

Common questions

When does false nettle bloom?: False nettle produces small greenish flower clusters from June through November, with timing varying somewhat by latitude and local growing conditions.
What growing conditions does false nettle need?: False nettle grows best in consistently moist to wet soil and tolerates full sun to fairly shaded sites, which is why it turns up in wet woods, floodplains, marsh edges and ditches.
Is false nettle useful for a butterfly garden?: Yes. False nettle serves as a larval host plant for Red Admiral butterflies, so leaving some foliage intact through the season supports their caterpillars.
Does false nettle need full sun to flower well?: No. It flowers reliably in full sun but also blooms in part sun or part shade, making it flexible for shadier wet spots in a garden or restoration planting.
Is Smallspike False Nettle toxic to livestock?: The USDA PLANTS Database does not flag Smallspike False Nettle as toxic to livestock.
Is Smallspike False Nettle HOA-friendly?: Smallspike False Nettle is generally an HOA-friendly choice in the right placement, with low maintenance.

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

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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