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botanical name:
Heracleum mantegazzianum
Heracleum mantegazzianum © Deeproot Plant Base
common name:  Giant Hogweed
family:  Apiaceae
characteristics: perennial
height: 5.00m
width: 3.00m
growth rate: very fast
growth habit: erect
leaf colour: white
flower colour: green
stem/bark: purple & green
main season: Summer
poison symbol poisonous or irritant
aspect: full sun, part shade
conditions: moist soil, wet/waterlogged soil
preferred soil pH: any
minimum temp: -35°C
USDA zone: 3 to 9
A genuine giant perennial with huge coarse, divided leaves and tall, thick, ribbed stems. The stems are hollow, hairy, and covered with reddish-purple markings. The leaf stalks are spotted. Produces massive branched, flattened umbels of greenish-white flowers, from late spring to mid summer.

Likes damp conditions and soil, often growing by water or marshes.
Can be very invasive.

By seed.

Originally planted in Britain as an ornamental for large gardens and estates.

other notes:
Native to the Caucasus mountains, but now naturalised in many other areas.

Contact can cause severe skin burns and blistering, especially with exposure to sunlight.

Listed as potentially invasive in the UK (Wildlife and Countryside Act, Schedule 9)

pronounced: hair-AK-lee-um man-te-gaz-zee-AH-num
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