Water Parsnip

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Other Names:
Hemlock Waterparsnip, Water-parsnip; Ktunaxa: naq̣aṇkam
Latin Name:
Sium Suave
Size *

The Water Parsnip (Sium suave) is a moisture-loving native of the carrot family with clusters of long, crisp, sweet white roots — a wetland vegetable that eats much like a carrot or parsnip.2, 4

Edible & Medicinal Uses

The plant produces a cluster of fleshy white roots that resemble small parsnips — crunchy and sweet, and delicious used any way you'd use a carrot: eaten raw and whole, shredded into salads and rice bowls, or cooked into soups and stir-fries. The young leaves are sometimes used as a relish. Roots are best harvested in spring and fall (young plants are the tender ones). WARNING: Water Parsnip closely resembles the deadly Water Hemlock and grows in the same wet places, so never wild-harvest it without expert identification — a mistake can be fatal. Because our nursery plants are known and labeled, you can grow and enjoy this one with confidence.1, 4

Ornamental Qualities

An elegant wetland plant, Water Parsnip sends up tall, hollow stalks topped with wide, lacy umbrellas of tiny creamy-white flowers in summer — a magnet for bees, beetles, and butterflies. Its leaves shift form depending on whether it's growing submerged, at the margin, or on land. It's lovely in a pond, ditch, rain garden, or bog edge.1

Environment & Culture

Ecology: Native across North America, Water Parsnip thrives in marshes, wet meadows, ditches, pond margins, and shallow water. Its abundant flowers are excellent forage for a wide range of pollinators, and it provides cover in wetland plantings.1, 2

Culture: The crisp roots are a traditional food of many peoples (Ktunaxa naq̣aṇkam), and the crushed root serves as a pain-relieving poultice for broken limbs. We offer it with respect for that living knowledge and invite support for Indigenous-led restoration through our Charitable Giving page.4

In the Kitchen

Harvest the fleshy root clusters in spring or fall, scrub them, and treat them like carrots: snack on them raw, shred them into a slaw or grain bowl, or simmer them into soups and stir-fries for a sweet, nutty note. (Growing and harvest details are on the Planting Guide tab.)

Attributes

  • Native Range: Across North America; marshes, wet meadows, pond margins1
  • USDA Zones: ~3–93
  • Light: Full sun to part shade1
  • Water: Wet — saturated soil to shallow standing water1
  • Soil: Mucky, wet1
  • Habit: Wetland perennial, 2–6 ft; white flower umbels2
  • Edible: Roots (raw or cooked, carrot-like) — wild-harvest only with expert ID1

References

  1. Wikipedia; Missouri Botanical Garden, Sium suave.
  2. Pojar, J. & MacKinnon, A., Plants of the Pacific Northwest Coast, 2014.
  3. USDA PLANTS Database, Sium suave.
  4. Moerman, D., Native American Ethnobotany, 1998; Kutenai ethnobotany.

Pot Sizing Guide

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Planting Guide: Water Parsnip (Sium suave)

Tip: Grow it in a pond margin, ditch, or bog where its wet feet are happy — and because you're growing a known, labeled plant, you can harvest the sweet roots with confidence.

When Your Plant Arrives

Open the box promptly and lift your plant out gently, holding the pot rather than the stem. Leave it in its biodegradable eco-pot for now — the roots are settled and don’t need disturbing yet. Give it a slow, thorough drink until water runs through the bottom, then set it somewhere bright but sheltered, out of harsh afternoon sun, drying wind, and frost. Let it rest and acclimate there for a few days before planting, so the move from our greenhouse to your garden is a gentle one. If anything doesn’t look right, please contact customer service within 7 days of delivery and we’ll take care of you.

Choosing a Site

Light: Full sun to part shade.

Soil & water: Wet, mucky ground to shallow standing water.

Space: 18–24 in apart.

Planting Steps

Plant plugs in spring into saturated soil or shallow water. Set at the depth they grew, firm, and keep flooded or saturated.

Watering & Care

Establishment: Keep wet at all times.

After establishment: Vigorous in wet ground; needs constant moisture.

Protection

Wildlife: Flowers feed many pollinators; cover in wetland plantings.

Water quality: As with any water-grown food, harvest edible parts only from clean water you would be comfortable eating from — wetland plants take up whatever is in the water.

Harvest Basics

Safety (critical): Water parsnip is a carrot-family plant that grows in the same wet places as water hemlock and poison hemlock — among the deadliest plants in North America, and dangerously easy to confuse with it. Never wild-harvest a wetland carrot-family root without absolutely certain, expert identification; eat only from plants you know for certain, like these.

Season: Fleshy white roots in spring and fall (young plants).

Use: Scrub and eat like carrots — raw, shredded, or cooked into soups and stews; crunchy and sweet.