Plant Profile: Heracleum mantegazzianum

Taxonomy: Heracleum mantegazzianum

Names

Cartwheel-flower, Giant Cow Parsley, Giant Cow Parsnip, Giant Hogweed, Hogsbane

  • Photo of Heracleum mantegazzianum (Heracleum mantegazzianums)

Phonetic Spelling:

Genus:Heracleum

Species:mantegazzianum

Family:Apiaceae

Giant hogweed is a large, herbaceous perennial belonging to the Apiaceae family, which includes carrots. This imposing plant can grow up to 20 feet in height and is considered a noxious weed in several states, classified as a Class A noxious weed in North Carolina. Its rapid growth allows it to outcompete native vegetation, particularly in areas near water bodies.

In terms of pests and diseases, the plant's sap is extremely toxic, leading to heightened sensitivity to ultraviolet rays, which can result in severe blistering and burns from sun exposure. Consequently, manually removing this weed poses significant risks and necessitates appropriate skin protection.

Heracleum mantegazzianum Feature Summary

Heracleum mantegazzianum Image Gallery

Tags

#invasive
#weedy
#perennial weed

Similar Plants

Heracleum mantegazzianum Feature Summary

Attributes
Fruit
Ellpicial and dry, resemlbe small apples .3" to .4" long and 1/4" wide. They have resin canals inside that are brown. Seeds are cream colored, flat with brown teardrop markings.
< 1 inch
Flowers
Large white umble (carrot-like) inflorecences appear from June-July. They can reach 2.5' across.
Leaves
Poisonous to Humans
Sap from the plant causes senstiviety to UV rays which results in severe burns and blistering of the skin.
Sap/Juice
Whole Plant Traits
Perennial
Herbaceous Perennial
Weed
Landscape
Weedy
Contact Dermatitis
Invasive Species

Heracleum mantegazzianum Attributes

Heracleum mantegazzianum: Country Or Region Of Origin

Transcaucasus

Heracleum mantegazzianum: Life Cycle

Annual
Biennial
Bulb
Perennial
Woody

Heracleum mantegazzianum Fruit

Heracleum mantegazzianum: Fruit Description

Ellpicial and dry, resemlbe small apples .3" to .4" long and 1/4" wide. They have resin canals inside that are brown. Seeds are cream colored, flat with brown teardrop markings.

Heracleum mantegazzianum: Fruit Length

< 1 inch
1-3 inches
> 3 inches

Heracleum mantegazzianum: Fruit Width

< 1 inch
1-3 inches
> 3 inches

Heracleum mantegazzianum Flowers

Heracleum mantegazzianum: Flower Description

Large white umble (carrot-like) inflorecences appear from June-July. They can reach 2.5' across.

Heracleum mantegazzianum: Flower Color

filter_vintage
White

Heracleum mantegazzianum: Flower Inflorescence

Catkin
Corymb
Cyme
Head
Insignificant
Panicle
Raceme
Solitary
Spadix
Spike
Umbel

Heracleum mantegazzianum: Flower Bloom Time

Winter
Spring
Summer
Fall

Heracleum mantegazzianum Leaves

Heracleum mantegazzianum: Leaf Description

Very large, up to 9'

Heracleum mantegazzianum: Leaf Color

spa
Green

Heracleum mantegazzianum: Hairs Present

No
Yes

Heracleum mantegazzianum Poisonous to Humans

Heracleum mantegazzianum: Poison Symptoms

Sap from the plant causes senstiviety to UV rays which results in severe burns and blistering of the skin.

Heracleum mantegazzianum: Poison Toxic Principle

Furanocoumarins

Heracleum mantegazzianum: Poison Severity

High
Low
Medium

Heracleum mantegazzianum: Causes Contact Dermatitis

No
Yes

Heracleum mantegazzianum: Poison Part

Bark
Flowers
Fruits
Leaves
Roots
Sap/Juice
Seeds
Stems

Heracleum mantegazzianum Whole Plant Traits

Heracleum mantegazzianum: Plant Type

Annual
Bulb
Carnivorous
Edible
Epiphyte
Fern
Ground Cover
Herb
Herbaceous Perennial
Houseplant
Mushroom
Native Plant
Ornamental Grasses and Sedges
Perennial
Poisonous
Rose
Shrub
Succulent
Tree
Turfgrass
Vegetable
Vine
Water Plant
Weed
Wildflower

Heracleum mantegazzianum: Growth Rate

Slow
Medium
Rapid

Heracleum mantegazzianum: Maintenance

Low
Medium
High

Heracleum mantegazzianum Stem

Heracleum mantegazzianum: Stem Is Aromatic

No
Yes

Heracleum mantegazzianum Landscape

Heracleum mantegazzianum: Problems

Allelopathic
Contact Dermatitis
Frequent Disease Problems
Frequent Insect Problems
Invasive Species
Malodorous
Messy
Poisonous to Humans
Problem for Cats
Problem for Children
Problem for Dogs
Problem for Horses
Short-lived
Spines/Thorns
Weak Wood
Weedy