Invasive Plants

War on weeds can offer advice and treatment programs for ALL other invasive plants species including:

Giant Hogweed


At 20ft tall with dinner table sized leaves Giant Hogweed is an impressive invasive plant that was once planted in gardens.  However, it is highly invasive and has spread throughout the whole of Great Britain, primarily favouring river banks but also other areas such as parks, cementries and wasteland.

The sap of Giant Hogweed contains toxic chemicals known as furanocoumarins.  When these come into contact with the skin, and in the presence of sunlight, they cause a condition called phyto-photodermatitis: a reddening of the skin, often followed by severe burns and blistering.  The burns can last for several months and even once they have died down the skin can remain sensitive to light for many years! Read more…


Himalayan Balsam


Himalayan balsam (Impatiens glandulifera) is a relative of the busy Lizzie, but reaches well over head height, and is a major weed problem, especially on riverbanks and waste land, but can also invade gardens. It grows rapidly and spreads quickly, smothering other vegetation as it goes. Read more…




Ragwort (Senecio jacobaea) is not usually a significant problem in gardens, but its poisonous qualities can make it a serious weed of paddocks and gardens backing onto fields grazed by horses or cattle. Read more…




Rhododendrons are a genus of flowering invasive plants found primarily in the northern hemisphere and introduced to Britain in the late 18th century. Some types are now a pest in Britain, because they out-compete many native plants and, because their leaves contain toxins that some animals find inedible, their spread is hard to control. Honey made from rhododendron pollen or nectar can cause hallucinations, loss of co-ordination and vertigo, but only if it has been made by the bees very recently. This is known as mad honey disease! Read more…

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