The two agencies will work as an integrated team to re-energise the 100-year-old brand alongside CALLING which will handle creative.
The appointment was made after a competitive pitch.
Sally Weavers, co-founder of Craft Media, said: ‘We rarely pitch for clients’ business but this was too exciting an opportunity to turn down.
“The Interflora business is fascinating, the team is ambitious and the brand’s potential is huge. We are excited to see how our communications strategy can help guide its development.’
Ed Cox, founder and Managing Director of Yonder Media, said: ‘When we met the team at Interflora we knew this was going to be a dream partnership. It’s an iconic British brand with huge potential and massive ambitions.
“Pair that with Yonder and Craft’s modern approach to media, and you have all the ingredients for something very special indeed.’
Caroline Adams, Head of Marketing at Interflora, said: ‘It’s an incredibly exciting time for Interflora.
“We are on a journey to re-energise our 100 year old brand and to help ensure it continues to make beautiful things happen for a whole new generation.
“We are clear on what our challenges are and finding the right partners to help us face this challenge head on is a key ingredient.
He added: “We ran an incredibly competitive pitch where the standard was exceptional but Craft and Yonder just had that something extra.
“Every interaction with them left us energised for the next. They’re exactly the right fit for us and we can’t wait to get going and working with their amazingly talented teams.”