With summer in full swing, people are being warned to look out for the hidden killers in their gardens.

There are several common plants that many people have in their back gardens - that are actually very poisonous for pets and humans.

If you eat plants like Lily of the Valley, Wisteria and Hydrangea, you could vomit and have a nasty rash.

Others have more sinister sounding names including Deadly Nightshade which can lead to hallucinations and convulsions and Hemlock, which in the most severe cases can be lethal.

A woman watering her garden

Even dessert favourite Rhubarb can cause damage if you eat the leaves.

A spokesperson for Garden Buildings Direct said: “Don’t be fooled by a pretty, sweet smelling plant – it could be hiding a deadly secret – and could leave you and your pet feeling a little under the weather.

“There are some on our list that clearly have lethal tendencies, like Deadly Nightshade and Hemlock. Others are a little more surprising.

“Take Hydrangeas for example. Who knew these beautiful, flower laden plants contained cyanide? And our springtime favourites Daffodils – if a dog digs up and chews on the bulb it could lead to vomiting, diarrhoea and convulsions.”

 

Here is  GardenBuildingDirect.co.uk ’s list of poisonous plants:

Lily of the Valley

It may smell and look lovely but the toxic compounds in Lily of the Valley called cardiac glycosides can leave you feeling dizzy, vomiting and covered in a rash.

 

Rhubarb

Delicious in a crumble as long as you just use the stalk and avoid the leaves. But eating too many may cause your kidneys to shut down.

Hand held freshly picked rhubarb

Wisteria

These plants rarely harm humans but the seed pods are toxic to dogs, cats and horses.

Loseley House, Stakescorner Road, Guildford - Re-launch of the Wisteria Tearoom, and pictures from the garden in spring.
Loseley House, Stakescorner Road, Guildford - Re-launch of the Wisteria Tearoom, and pictures from the garden in spring.

Daffodil

The bulbs are the dangerous part of this plant. If you have a dog that loves to dig, keep them away from your daffs. Eating them will cause vomiting, convulsion and diarrhoea.

Hydrangea

These contain cyanide. But don’t worry, you need to eat lots for it to be fatal.

Purple, blue and pink Hydrangea flowers (Hydrangea macrophylla) in a garden
Purple, blue and pink Hydrangea flowers (Hydrangea macrophylla) in a garden

Deadly nightshade

Most common in central, eastern and southern parts of the UK, this can cause dilated pupils, problems balancing and a rash. It may eventually lead to hallucinations and convulsions.

A species of the poisonous plant deadly nightshade

English yew

Almost every part of this is poisonous, especially the leaves and seeds. Eating these can leave you feeling dizzy, have a dry mouth and dilated pupils.

 

Hemlock

Often found on riverbanks and in ditches, this can cause sickness if eaten. In severe cases, it can kill by paralysing the lungs.

t Photo of the Rhododendron

Rhododendron

This beautiful plant produces 'mad' honey. In Roman times troops were given honey made from the plant which poisoned them.

Symptoms include vomiting, confusion and heart problems.

Rhododendron ponticum in flower
Rhododendron ponticum in flower