It easily achieves heights of up to 5 meters with similar aggressive horizontal spread. It is evergreen and produces purple flowers which give rise to fruit with many seeds. This dense, suckering shrub is a prolific grower and highly invasive. Rhododendron has caused problems for British horticulturalists since its deliberate introduction in the 18th century. Its bright green foliage purplish stems and large black berries make it hard to avoid and a risk to youngsters who may want to taste the berries.Īlso Known As:Rhododendron Ponticum, Common Rhododendron, Pontic Rhododendron Rhododendronĭistribution: Native to the Iberian peninsula and the Caucasus, invasive in Western Europe and New Zealand. Pokeweed is an extremely tall herbaceous plant that spreads and achieves heights of up to 2.5 meters in a single summer.Īs it matures, it gets more and more toxic. This is a nasty poisonous plant that has a long history of killing people who ingest its roots, leaves and berries. It produces a large foxglove-like flower which yields fruit and seed that are widely disseminated by wind and water.Īlso Known As:Phytolacca Americana, American Pokeweed, Dragonberries, Poke Sallet, Inkberry, Poke Salad Pokeweedĭistribution: Native to eastern North America, introduced to Europe and Asia. The young growth has whorls of heart-shaped or multi-lobed leaves. It is hard to imagine a taller garden weed with its young growth can achieve a growth rate of over 2.5 metres per season. You may be incredulous at the thought of a full, blown tree being a garden weed, but this deciduous hardwood is known for its fast growth and invasiveness which has been wreaking havoc across North America! Paulownia TomentosaĪlso Known As: Paulownia Tree, Foxglove-Tree, Princess Tree, Empress Tree Paulownia Tomentosaĭistribution: Native to China and the Korean peninsula, invasive in North America, introduced to Europe and South Africa. Have a look at these mugshots and our advice on the best methods of eradication. It is not difficult to miss these tall garden weeds.Įvery single species profiled achieves growth of over 1.5 metres in height in a single summer and are very efficient at spreading prolifically. You May Find Helpful 11 Tall Garden Weeds.
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