It’s well-known that a landscaped and well-kept garden can increase a home’s value.

However, some “dangerous” plants which could be lurking in your garden and can put your home value at risk.

Chartered surveyors Stokemont have worked with property surveyor Bradley Mackenzie to share the plants which homeowners need to look out for.

1. Japanese knotweed

An invasive plant with bamboo-like shoots which can grow up to three metres tall in the summer is Japanese knotweed.

Its roots can reach down to 20 metres underground and according to the experts, can destroy pipework and drains as well as weaken foundation or paving.

Bradley said: “If you spot Japanese knotweed in your garden it is really important to take immediate action before it’s too late.

“We would highly recommend you seek professional help when removing them as they re-establish easily from even the smallest remains.

“If you prefer doing it yourself, a strong herbicide such as glyphosate would be the most effective to kill those zombie-like plants.”

2. Giant hogweed

Like Japanese knotweed, giant hogweed has an invasive nature and can spread very quickly.

This plant has thick green stems with purple shoots and white flowers shaped like a round umbrella on the top, similar to cow parsley.

The expert said: “Giant hogweed is widespread across the UK, especially around rivers and ponds. Its sap is phototoxic and can cause severe skin burns or scars under sunlight.

“Though it’s unlikely to cause direct harm to your property, buyers may still refuse to pay a higher price if this weed is present because of its high cost of removal, up to £15,000.”

3. Buddleia

Also known as butterfly bush, this plant has small purple or white flowers with a honey-like fragrance and long, narrow leaves.

Whilst it looks pretty, its roots can damage materials as they can grow through brickwork and cause costly repairs. The property surveyor added: “Buddleia can be treated with herbicide, either sprayed or injected into the trunk.

“If carried out correctly, the plant will then die, however, it will need to be extracted from where it may be lodged in the wall. It is therefore recommended that you consult a professional, rather than trying to remove it yourself.”

4. Himalayan balsam

This plant was brought to the UK in 1839 and can grow up to three metres tall during the summer and early autumn.

It’s becoming a common sight in the UK but it is illegal to plant in the wild due to its significant ecological impact and potential buyers may be wary.

5. Rhododendron ponticum

This plant is illegal to plant in the wild as well as illegal to allow it to spread from your property due to its vigorous nature.

Bradley advised: “There are several methods which you can attempt to use to remove this plant, such as hand pulling or stump treatment, however, these methods depend on the size of the infestation and it might be difficult to know which one will be the most effective.”

Therefore, homeowners are advised to talk to professionals if they have this plant on their property.