Details of...
Scientific Name: Heracleum mantegazzianum
Pronunciation: hair-uh-KLEE-um man-tee-gaz-zee-AH-num
Common Name: giant hogweed
Family Name: Apiaceae
Plant Type: Invasive plant, Biennial
Key ID Features: Stems green with obvious purple blotches, stiff white hairs - especially at nodes; leaves deeply lobed, sharply toothed, and serrated.
Course(s): Level 2 Apprenticeship

Habit: Upright
Texture: Very coarse
Mature Size:
Height:3 - 5m
Spread:2 - 3m
Growth Rate:Fast
Origin: Central / west Asia
Hardiness Rating: Zone 3: (-40 to -34 C)
Exposure: Full sun
Soil/ Growing Medium: Well-drained
Water Use: High
Landscape Uses: (Caution: poisonous parts)
Additional Info: Google. Caution wear protective clothing (the sap can also cause blindness and photodermatitis that can last for up to 10 years). LEPS Fact Sheet. Compare to the native plant, cow parsnip.
giant hogweed
Leaf Morphology: Glossary
Form: Lobed, Simple
Arrangement: Alternate
Texture/ Venation: Pinnate venation, Soft flexible
Surfaces: Pubescent
Colour in Fall: Yellow
Leaf(let) Terms:
Shapes: Ovate
Apices: Obtuse
Bases: Hastate
Margins: Dentate, Incised, Palmately lobed, Pinnately lobed, Serrate

Inflorescence Type: Floriferous, Umbel
Flower Morphology:Flowers perfect
Number of Petals:5
Corolla Shape:Rotate/stellate
Ovary Position:Inferior
Colour (petals): Showy, White
Flower Time at Peak: May, Jun

Fruit Type: Schizocarp
Fruit Colour: Brown
Fruiting Time: Jul, Aug
Additional Info: Not showy

Bark or Stem Colour: Green, Dark brown
Additional Info:Caution: sap can cause severe burns and blindness.
Organ Modifications: Storage tap root

(NCA) Not Currently Available : needed
Location Map

Report an Error