Selling your home in Sussex? These five garden plants could devalue your property

The surveying practice has done the research, revealing the estimated cost of removing each invasive plant.

Property expert Bradley McKenzie of Stokemont also provided some advice on how to spot them.

1: Japanese knotweed (UK search volume: 90.5,000, estimated removal cost up to £15,000).

Japanese knotweed is one of the plants that could devalue your home if you’re trying to sell in Sussex

This plant has red bamboo-like shoots and shovel-shaped leaves and can grow up to three meters tall in spring and summer.

Its roots can also reach 20 meters underground, according to Stokemont, which could “destructure” pipes and drains and weaken the foundations or paving of buildings.

Japanese knotweed is listed as a property defect by RICS Homebuyer Reports, with the potential to reduce the price of a property by 5-15%.

Bradley said: “We strongly recommend that you seek professional help when removing them, as they recover easily from even the smallest remnants.

“If you prefer to do it yourself, pesticide would be the most effective method of killing those zombie-like plants.”

2: Ivy (33,100k UK search volume, estimated removal cost up to £1,000)

English ivy is strong at climbing walls and can penetrate wall cracks, damaging mortar and causing dampness and leaks.

Bradley said: “Unlike giant hogweed, English ivy can be removed with bare hands by carefully peeling them away from the wall.

“It is also possible to kill them by cutting their roots and letting them dry out.”

3: Giant Hogweed (UK search volume 22.2,000, estimated removal cost up to £15,000)

Giant hogweed is invasive, spreads quickly and is most easily spotted in June and July.

It looks like cow parsley but has thick green stems with purple flecks, as well as round umbrella-shaped white flowers.

Bradley said: “Widespread throughout the UK, particularly around rivers and ponds, its sap is phototoxic and can cause severe skin burns or scarring in sunlight.

“Although it does not cause direct damage to the property, buyers can still refuse to pay a higher price if present due to its high cost of removal – up to £15,000.”

4: poplars, willows and oaks (UK search volume: 14.8,000, estimated removal cost up to £3,000)

Large trees such as poplar, willow and oak can be dangerous if grown near a property.

The root systems of these trees are shallow and fast growing and can extend up to 40 meters, absorbing 1,000 liters of water and nutrients from the soil.

Bradley said: “If grown too close to your property they could lead to additional risk of foundation cracks, subsidence and other structural faults, which could cost you between £5,000 and £25,000 to to fix.”

5: Himalayan Balsam (UK search volume 12.1K, estimated removal cost up to £2,000)

This Himalayan plant was brought to the UK in 1839 and can grow up to three meters tall.

It has pink flowers in summer and early fall and can spread 800 meters from seed or across rivers.

This can potentially kill other plants and reduce biodiversity by stealing any lights, nutrients or water.

Visit www.stokemont.com to find out more about the work of this multidisciplinary surveying practice.

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