A picture of a Common Hogweed

Common Hogweed

Heracleum spp.

Also known as

Cow Parsnip

HeracleumSosnowskyi 001 by Hugo.arg (CC-BY-SA-3.0)

Full Sun
Moderate watering
Frost Hardy

6a

USDA zone

-23°C

Minimum temperature

Expected size

Height
Spread

2m

Max

1.5m

50cm

Min

50cm

Flowering

More images of Common Hogweed

HeracleumSphondylium2
Herkulesstaude fg01
Heracleum maximum 2
Heracleum mantegazzianum R.H. 07
Heracleum mantegazzianum 07

Common Hogweed Overview

Heracleum is a genus containing approximately 52 biennial or perennial species in the carrot family, Apiaceae. They are commonly known by the names hogweed and cow parsnip and can be found across the Northern Hemisphere in temperate climates. Some are found in mountainous areas in Ethiopia this represents the southernmost range of this genus. These plants have large leaves, often divided and many species have thick, hairy, ribbed stems covered with reddish-purple markings. Massive green-white or pink flowers arranged on structures called umbels appear in late summer. Umbels are clusters which radiate from a central stem point, producing flowers on stalks of roughly equal length, to form a flattened or slightly rounded, horizontal surface of blooms. A stunning architectural plant once grown as an ornamental plant in the 19th Century, it is now an offence to plant or encourage certain species to grow in the wild in the UK. For example giant hogweed, Heracleum mantegazzianum. This thuggy plant is easily confused with the related species Heracleum sphondylium, commonly called hogweed, these plants grow to notably different sizes, but are tricky to distinguish. Plant size is the best identifier, this species grows much larger compared to hogweed. The leaf shape also differs slightly between these species. For this plant, giant hogweed, the leaves are more textured, pointed and in a three-dimensional arrangement and in hogweed, the leaves are generally arranged in a flat, single plane.

Special features of Common Hogweed

Attractive flowers

Attractive leaves

Attracts butterflies

Attracts useful insects

Attracts bees