Fenwickfield's picture

Giant Hogweed

Observed: 11th April 2011 By: FenwickfieldFenwickfield’s reputation in PlantsFenwickfield’s reputation in PlantsFenwickfield’s reputation in PlantsFenwickfield’s reputation in PlantsFenwickfield’s reputation in Plants
Giant Hogweed (2)
Giant Hogweed (2) 1
Giant Hogweed (2) 1 2
Giant Hogweed (2) 1 2 3
Description:

Robust,roughly hairy perennial with hollow ridged stems in open area of woodland,flowers off-white,with unequal petals in umbels with 40 or so rays,be carefull not to get the juice of the plant on your skin as it causes blisters when exposed to the sun,found this out on a sunny day strimming an orchard full of the stuff.

Identifications
Species interactions

No interactions present.

Species with which Giant Hogweed (Heracleum mantegazzianum) interacts

Comments

cicuta58's picture

Heracleum

Giant Hogweed is in fact, Heracleum mantegazzianum (among others).

cicuta58

Fenwickfield's picture

When

When did this one change I will edit to mantegazzianum as you have said.Thank's for giving the updated name

Fenwickfield

cicuta58's picture

Change?

Heracleum sphondylium has been (common) Hogweed and H mant. Giant Hogweed for many years!

cicuta58

Fenwickfield's picture

Just noticed

I had a look in my book and your right I was looking at common and giant was underneath,but thanks for pointing it out

Fenwickfield

Fenwickfield's picture

is giant

I am six foot tall and it was at least 3ft l higher than me,also you can snap the stem and hold it to get the seed head picture,and photo's can not give true scale

Fenwickfield

AlanS's picture

The fruits give the answer

The fruits confirm this is simply a large, ordinary Hogweed (Heracleum sphondylium), and, as John Bratton has pointd out, the young leaves are too downy for GH. For that matter, the stems are too smooth for GH.

They do occasionally hybridise (but this isn't a hybrid), and according to Sell & Murrell, we have three Giant Hogweed species in Britain, NONE of which is H. mantegazzianum.

Following their views, probably the commonest GH is H. trachyloma, but, as they note, hardly anyone collects and presses complete specimens of Giant Hogweed,for some reason ...

H. sphondylium is recorded as reaching 3 metres in height.

Alan

Fenwickfield's picture

Big Common

Well it must like were it is growing to reach this size,it is rather boggy heavy acid soil and sheltered, maybe they don't collect it as it burns your skin as I have had some rather bad blisters from this plant.Thanks for the explaination as it help's understand why I have mistaken it for Giant.

Fenwickfield