Property expert Kevin Barzegar, from Surrey estate agents Kaybridge Residential, has warned homeowners that certain 'problematic' plants could lead to thousands of pounds in repairs and reduce house sale prices by as much as 15%. He advises thinking long-term when choosing garden plants, as attractive features can become serious liabilities.
Bamboo, often used for privacy screens, has an aggressive root system that can travel several metres horizontally, pushing through paving, damaging structures, and cracking foundations. Once established, it is difficult to control as roots regenerate from tiny fragments. Kevin suggests ornamental grasses like miscanthus as a safer alternative.
English Ivy, while charming, can cause structural damage by burrowing into mortar and brickwork. Its dense foliage traps moisture, leading to damp problems, and removal can damage walls further. Kevin recommends flowering climbers such as clematis or climbing roses trained on trellises away from walls.
Japanese Knotweed is described as a homeowner's nightmare, capable of making properties virtually unsellable. It grows up to 10cm a day, with tough roots exploiting cracks in paving and foundations. Under the Wildlife and Countryside Act 1981, it is an offence to cause knotweed to spread, and treatment can cost between £900 and £20,000. Kevin suggests photinia or laurel hedging as fast-growing alternatives.
Willow trees, if planted too close to buildings, can cause extensive damage. Their roots seek out water and can extend up to three times the height of the tree, cracking pipes and affecting foundations. Kevin advises planting willows at least 40 metres from buildings or choosing smaller alternatives like Japanese maple.
