NHS Blood and Transplant has launched the ‘Blood doesn’t grow on trees’ campaign

In the last couple of months, supporters all over the country have been knitting more than 8,000 red, woollen blood drops and wondering what on earth they planned to do with them.

Residents have woken to find woolly street art adorning trees in city centres and outside train stations. A cheerful kind of knitted graffiti. Urban art that makes you smile, and wonder why.

The blood drops represent a continued need for new donors. NHS Blood and Transplant needs around 200,000 new donors each year just to keep numbers stable.

To become a blood supporter, click here to download some promotional tools or use the blood drop pattern and get knitting