Pastinaca sativa

Wild Parsnip Identification & Control

Wild Parsnip is an exceptionally hazardous, highly persistent biennial broadleaf weed in the parsley family. Famed for its bright yellow flower heads and highly edible taproot, it has Escaped cultivation to become a major public health hazard along roadsides, pastures, and home garden edges. Like Giant Hogweed, the entire plant is saturated with highly toxic **furanocoumarins** in its sap. Contact with this sap followed by exposure to sunlight causes severe, painful phytophotodermatitis, resulting in intense skin blistering and long-lasting hyperpigmented scars.

Sunlight Full Sun to Partial Shade

Watering Tolerance Low to Moderate

Soil Adaptability Dry Clay / Sandy / Any Soil / Disturbed

Growth Temp 8°C - 38°C

Danger / Toxicity Severe Sun Blistering / Phototoxic Sap

Botanical macro photography of Wild Parsnip (Pastinaca sativa) - Plant AI care and control database

How to Identify Wild Parsnip

A tall biennial with hollow grooved stems, compound leaves with mitten-shaped leaflets, and flat umbrella-shaped yellow flower clusters.

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Mitten-Shaped leaflets: Opposite compound leaves carry 5 to 15 leaflets that are sharply toothed, frequently displaying a highly distinct 'mitten' shape with a thumb-like lobe.
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Flat Yellow Umbels: In its second year, it shoots up tall stems topped with flat, umbrella-like clusters (umbels) of tiny, bright golden-yellow flowers.
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Hollow Grooved Stems: Stems are strictly smooth (completely hairless), hollow, bright green, and heavily grooved or ribbed vertically.

⚠️ Phototoxic Warning: Never mow Wild Parsnip! Weed-whacking or mowing flings the phototoxic yellow-green sap onto your arms and legs. Once exposed to sunlight, you will develop severe, painful water blisters (parsnip burns) that take weeks to heal.

Complete Care & Management Guide

Access highly technical, scientific management directives to control or cultivate Wild Parsnip effectively.

Highly drought-tolerant once established due to its deep taproot. It thrives in dry, parched roadside margins and parched soils where turf grass fails.

Extremely dangerous. Mowing or weed-whacking is highly hazardous as it flings toxic sap. Manual cutting requires strict waterproof clothing and safety glasses.

Highly aggressive. It grows in dense, competitive clumps that completely shade out native pasture grasses, while actively depleting soil nutrients.

Prefers Full Sun to partial shade. It easily establishes along open, wet pasture borders and disturbed garden edges where moisture is abundant.

Adapts to clay, rich loam, sandy loam, and gravelly forest edges, provided the substrate is well-drained. It struggles in swampy soils.

Spreads aggressively strictly by seeds. A single plant can produce up to 10,000 seeds that can remain viable in the soil for up to 4 years.

A biennial. First-year rosettes stay green and active under winter snow. Second-year stems grow rapidly in early spring, flowering and dying by mid-summer.

Features an exceptionally deep, thick, vertical white taproot that resembles a domestic parsnip. Complete manual extraction requires a sturdy spade and complete protective gear.

Occasionally targeted by parsnip webworms, which feed heavily on the yellow flower heads, acting as a helpful natural biological control.

Highly disease-resistant. It suffers virtually zero structural damage from natural plant diseases, maintaining highly aggressive growth.

To control Wild Parsnip organically, wear thick gloves and long sleeves. Use a sharp spade to cut the taproot 2 inches below the soil surface to kill the crown, and landfill. NEVER burn it.

Common Diseases & Treatment

Parsnip Burn Contact

Symptoms: Symptoms: Skin exposed to sap develops severe redness, itching, and raised water blisters within 24-48 hours after exposure to sunlight.

Action: Action: Wash the skin immediately with cold water and soap. Keep the affected skin completely covered and out of sunlight for 48 hours. Seek medical care.

Crown Regrowth

Symptoms: Symptoms: The flat green rosette grows back rapidly after you mowed the first-year leaves.

Action: Action: Manual excavation. Mowing first-year leaves will not kill the weed. Use a spade to cut the white taproot 2 inches below the soil line.

Frequently Asked Questions

Why does Wild Parsnip sap burn the skin?

Its sap contains furanocoumarins, which are highly phototoxic. When they touch your skin and are exposed to UV light (sunlight), they chemically bind to your cellular DNA, destroying your skin cells. This causes severe chemical burns and massive blisters.

Is Wild Parsnip really edible?

Yes! Wild Parsnip is the exact same species as the cultivated parsnips we buy in supermarkets. The first-year white taproot is highly sweet and edible. However, harvesting it is extremely dangerous due to the phototoxic sap in the leaves, and the risk of mistaking it for Deadly Water Hemlock.

How is Wild Parsnip different from Queen Anne's Lace?

Wild Parsnip always has bright golden-yellow flower clusters, and coarse compound leaves with mitten-shaped leaflets. Queen Anne's Lace always has white flower clusters with a dark-purple center flower, and highly delicate fern-like leaves.

What is the best way to eradicate Wild Parsnip organically?

Wait until early spring. Wear thick long sleeves and chemical-resistant gloves. Use a sharp spade, angle it at 45 degrees, and slice through the taproot at least 2 inches below the soil line. This separates the root crown from the root, destroying it.