'Blood Doesn't Grow on Trees'
NHS Yarnbombing Campaign 
2014

NHSBT spokesperson Donna Batty said:
“We started preparing for our campaign several months ago by appealing to knitters to help us create the blood drops."

“We had a tremendous response – more than a thousand people have got involved and we’re hugely grateful for everything they’ve done. As a result of their efforts, we’ve now got more than 8,000 blood drops which we can use to spread our message that ‘blood doesn’t grow on trees’.

A campaign that used yarnbombing to encourage more young people to donate blood.
The woollen street art aimed to raise awareness of the need for more donors, as the number of people aged between 17 and 24 who sign up to give blood had fallen significantly.
The campaign saw knitted red blood drops hung from trees in busy public places, as well as promotion across social media.