Bluebells are in bloom at Okehampton Castle in Devon

One of the South West's most popular spring flowers could soon be a thing of the past.

The British bluebell, which is found in woods across the region, is under threat from the Spanish bluebell.

The two flowers are breeding together, producing a hybrid.

Experts have warned the British bluebell will be extinct in 10 years if it is allowed to crossbreed with its Spanish cousin.

Overrunning flowers

Okehampton Castle in west Devon is often resplendent in bluebells from spring onwards.

But while the Norman castle has no doubt seen off many unwanted visitors, the British bluebells that surround it are currently facing invasion.

English Heritage fears the Spanish bluebell is overrunning the indigenous flowers.

Diana Richards from English Heritage said: "The Spanish flowers are taking over the native ones and they are causing hybrids.

The Royal Horticultural Society (RHS) has said it is doing what it can to help all gardeners to be responsible and aware of environmental issues including the threat posed by non-native invasive species.

The RHS said: "Most exotic species introduced to this country pose no threat to our native flora but those identified need careful management.

"Invasive plants can cause competition for nutrients, light and space, can affect the genetic integrity of native plant populations and can alter plant populations and communities in terrestrial and freshwater situations.

"All those involved in the gardening industry have a responsibility to ensure their actions do not result in ecological damage in the countryside."