What growing conditions does water parsley need?

Water parsley grows best in consistently wet to saturated soil with part sun to part shade, mimicking the streambanks and marsh edges where it is typically found.

When does Oenanthe sarmentosa bloom?

It flowers from May through July, producing small clusters of white flowers typical of the carrot family.

What insects visit water parsley flowers?

Bees and flies are the main visitors to the small white umbel flowers, which offer easy access to nectar for a range of short-tongued pollinators.

Does water parsley stay green year round?

No, it is a deciduous herbaceous perennial that dies back to the root system in winter and resprouts in spring.

Is Water Parsely HOA-friendly?

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

Water Parsely

Name: Pollinator Patch
Author: Pollinator Patch

Oenanthe sarmentosa

Last reviewed: August 2026

Oenanthe sarmentosa, or water parsley, is a wetland forb found along streambanks, ditches and marshes in the Pacific coast region. It blooms May through July with small white flower clusters that draw bees and flies.

Toxicity unknown

Water Parsely (Oenanthe sarmentosa) 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

part sun

Water

high

Size

12"–48" H × 12"–36" W

Bloom

May, Jun, Jul

Native to

CA, OR, WA

Pollinators

bees, flies

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Browse plants for this ecoregion

Coast Range Puget Lowland Marine West Coast Forest Northwestern Forested Mountains Sierra Nevada Central California Foothills and Coastal Mountains Central California Valley Southern California Mountains Southern California/Northern Baja Coast

Water parsley is a moisture-loving native perennial that thrives in wet soils and boggy areas. It produces delicate white flower clusters from late spring through summer and can spread to form colonies in suitable conditions. This plant goes dormant in winter, dying back to the ground before regrowing in spring.

Growing Water Parsely

Grow Water Parsely in part sun and high water. Mature plants reach 12 to 48 inches tall and spread 12 to 36 inches wide. Expect low maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

Water Parsely 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.

Looks weedy and informal when growing
Dies back completely in winter leaving bare spots
Spreading habit can appear unkempt

Wildlife value

The umbrella-shaped flower clusters attract various pollinators including native bees and beneficial flies during its long blooming period from May through July.

Common questions

What growing conditions does water parsley need?: Water parsley grows best in consistently wet to saturated soil with part sun to part shade, mimicking the streambanks and marsh edges where it is typically found.
When does Oenanthe sarmentosa bloom?: It flowers from May through July, producing small clusters of white flowers typical of the carrot family.
What insects visit water parsley flowers?: Bees and flies are the main visitors to the small white umbel flowers, which offer easy access to nectar for a range of short-tongued pollinators.
Does water parsley stay green year round?: No, it is a deciduous herbaceous perennial that dies back to the root system in winter and resprouts in spring.
Is Water Parsely HOA-friendly?: Water Parsely 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

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