Leafy spurge

Discuss this plant with the guide — choose this profile as a possible match and prepare your observations for Colorado Plants & Practical Care.

Euphorbia esula

Colorado noxious weed · List B — Stop the spread. J-leafy-spurge

Established in some areas. Requirements vary by location: eradication, containment or suppression to stop further spread. This is a management category, separate from danger ratings. Category source · What the lists mean.

Irritating sap; eye injury risk. Native status, garden use and noxious-weed class are separate from toxicity. Exposure help.

Identification caveat: Colorado references use Euphorbia esula. Leafy-spurge taxonomy can involve closely related taxa; this profile does not resolve every population or hybrid.

Still researching this plant

This is a sourced working profile. The cited findings are available below. Identification and source-photo limits are explained below. Independent botanical and veterinary review is pending. Uncertainty is not a finding that the plant is safe.

Three views of this plant

Photos are source-identified examples, not a complete identification key. Check leaves, stems, flowers and fruit together. Locations are not assumed to be in Colorado.

Euphorbia esula: Dense upright leafy stems topped with yellow-green flower clusters. — **habit** — Dense upright leafy stems topped with yellow-green flower clusters.
H. Zell · CC BY-SA 3.0
Photo source and identification
Original record · Original image
Source page scientific identification plus visual morphology review of the selected photograph. This is a source-identified reference image, not a specimen-based taxonomic determination. Leafy-spurge taxonomy is complex. North American invasive leafy spurge is frequently assigned to Euphorbia virgata or an E. esula aggregate. These are source-identified E. esula reference photographs, including a leaf explicitly labeled E. esula sensu stricto; do not assume they prove a Colorado plant is E. esula in the narrow sense.
Wikimedia server-resized derivative; no crop, color change, or generative editing. Gallery display preserves the full image; the catalog preview uses a CSS crop.

Euphorbia esula: Close view of yellow-green bracts, cyathia, and rounded developing capsules. — **flower** — Close view of yellow-green bracts, cyathia, and rounded developing capsules.
Kristian Peters -- Fabelfroh 13:02, 3 November 2005 (UTC) · CC BY-SA 3.0
Photo source and identification
Original record · Original image
Source page scientific identification plus visual morphology review of the selected photograph. This is a source-identified reference image, not a specimen-based taxonomic determination. Leafy-spurge taxonomy is complex. North American invasive leafy spurge is frequently assigned to Euphorbia virgata or an E. esula aggregate. These are source-identified E. esula reference photographs, including a leaf explicitly labeled E. esula sensu stricto; do not assume they prove a Colorado plant is E. esula in the narrow sense.
Wikimedia server-resized derivative; no crop, color change, or generative editing. Gallery display preserves the full image; the catalog preview uses a CSS crop.

Euphorbia esula: Magnified photographed leaf tip with its broad rounded apex and scale. — **leaf** — Magnified photographed leaf tip with its broad rounded apex and scale.
Stefan.lefnaer · CC BY-SA 4.0
Photo source and identification
Original record · Original image
Source page scientific identification plus visual morphology review of the selected photograph. This is a source-identified reference image, not a specimen-based taxonomic determination. Leafy-spurge taxonomy is complex. North American invasive leafy spurge is frequently assigned to Euphorbia virgata or an E. esula aggregate. These are source-identified E. esula reference photographs, including a leaf explicitly labeled E. esula sensu stricto; do not assume they prove a Colorado plant is E. esula in the narrow sense.
Wikimedia server-resized derivative; no crop, color change, or generative editing. Gallery display preserves the full image; the catalog preview uses a CSS crop.

Recognize

Upright stems, narrow leaves and yellow-green bracts surrounding small flowers. All parts contain milky latex. Do not break stems just to test for sap. N-euphorbia-esula

Plants & habitat

Spreads by roots and seed, forming persistent patches that displace vegetation. Root fragments can regrow. J-leafy-spurge

People

Sap can cause dermatitis and potentially permanent eye damage; ingestion can blister the mouth. Protect skin and eyes. N-euphorbia-esula

Dogs & cats

NC State flags both dogs and cats and advises keeping pets away. A pet-specific toxic dose is not provided. N-euphorbia-esula

Other animals

Cattle can suffer lesions and digestive irritation. Managed sheep or goat grazing is a specialist control method, not evidence that unrestricted consumption is safe for all animals. J-leafy-spurge

Evidence scope: Animal-group-specific management evidence.

Before taking action

Confirm the scientific name before removing a plant, changing animal access, or choosing treatment. An evidence gap means this review has not resolved the question. It does not mean safe. For listed weeds, consult your county weed program about the requirements for your location; follow the current label for any pesticide. S27

References

J-leafy-spurge — Leafy Spurge, Jefferson County, Colorado. Accessed 2026-09-07T00:27:23+00:00. Locator: Description, impacts, Colorado list designation, management.
N-euphorbia-esula — Euphorbia esula — Plant Toolbox, NC State Extension. Accessed 2026-09-07T00:24:01+00:00. Locator: Description, Attributes, Poisonous to Humans, Problems.

Content revised 2026-09-07 03:50:00Z · Source checks dated separately in the references.