Britain's native bumblebees are under serious threat and gardeners should plant bumblebee-friendly plants to help save them, the National Trust and English Nature said on Friday.
Intensive agriculture and a decrease in the number of insect-pollinated crops have led to a drastic decline in bumblebee numbers over the past 70 years, they said.
The bumblebee is frequently mistaken for the honey bee
With fields turning into poor homes for bumblebees, gardens are an increasingly important habitat for them.
"Without wild bees our gardens would be sterile places but we do not always give enough thought to how we manage our gardens to encourage these beneficial insects," said Fiona Reynolds, director-general of the National Trust.
"Every garden counts in the wildlife stakes, whether large or small, urban or rural. With over 15 million gardens across the country, gardeners collectively can make a huge difference," she said.
Most bees are solitary
80% of the food we eat comes from crops pollinated by bees
25% of Britain's 250 wild bee types are rare or threatened with extinction
Some species have declined by as much as 60% since the 1970s
There are 24 species of bumblebee in Britain
Three bumblebee species and at least seven other bee species have become extinct in the last 150 years
English Nature and the National Trust say many gardeners mistakenly think all flowers are good for bees, when in actual fact, many modern hybrids are sterile and do not carry pollen to attract the bees.
Bumblebees are also wrongly thought by some to be aggressive, usually because they are confused with wasps and honey bees.
The two bodies will be promoting ways to encourage the bumblebee and other wildlife at the Chelsea Flower Show later in May.