In 1920 a florist, Joe Dobson, of Leighton's Seedsmen and Florists in Glasgow, and a nurseryman, Carl Englemann in Saffron Walden, Essex were looking to increase their business. They knew of the Florists Telegraph Delivery Association (now known as Florists' Transworld Delivery) which had existed in the US since 1910, and applied to join as foreign members. In 1923 the UK arm of the FTDA was formed with 17 members. One of the straplines used in advertising was Flowers by Wire when the telegraph was actually used to communicate between florists. Later, telegrams were sent from member to member requesting deliveries to be made in the recipient florists area. In the original Interflora Directory, used by members, the longest established members could be recognised by their telegraphic address. This would be the only telegraphic address in that city to include the name Interflora. In the case of the founding members, their telegraphic addresses were "Interflora Glasgow" and "Interflora Saffron Walden" respectively.
In 1953 the name changed to Interflora and the slogan Flowers Worldwide along with the Mercury Man roundel became well known. Say it with Flowers became the subsequent and most famous slogan associated with Interflora.
When telegrams became obsolete the most used method for requesting deliveries was by telephone. Following that Interflora brought in messenger1 in the mid to late 1980s, this system was very similar to sending a fax. In the late 1990s messenger2 was introduced, that used the internet to transmit orders.
In the early part of this century Interflora brought out a system called Rose, this used the internet but instead of a dial up connection a broadband connection was used. This enabled orders to be transmitted in real time. In 2011 Rose was updated to ROSEGold which provides a real time service between the call-centre in Sleaford, Lincolnshire and the Interflora members around the United Kingdom.
In 2005, the Interflora British Unit moved from being a trade association to a private equity ownership under investment company, 3i.
3i sold British Interflora to US-based FTD Group, the successor to Florists' Transworld Delivery, in 2006.
In 2008, United Online Software Development acquires Interflora and FTD.
A book entitled The History of Interflora was written by Geoffrey Lewis in 1977 (Interflora's Jubilee year), also published in 1986 as The Interflora Story 1923-73.
In 2014 Interflora agreed a partnership deal with ITV's primetime show, Surprise Surprise! Surprise, Surprise is presented by Holly Willoughby. The deal saw the launch of the 'Surprise Someone Special' campaign which is fronted by Mark Wright (TV personality).
- Interflora British Unit (UK): IBU renounced its co-operative structure when purchased in 2006 by FTD Group (Interflora's US affiliate)
- Fleurop-Interflora NE Europe Unit: Estonia, Latvia, Lithuania, Ukraine, Belarus
- Fleurop-Interflora: Europe
- Interflora Australian Unit
- Hana Cupid (Japan): formerly known as Japanese Florists Transworld Delivery (JFTD), until a disagreement was had with FTD in the US, and JFTD disassociated itself from FTD and renamed itself Hana Cupid.
- Interflora Pacific Unit (New Zealand, Hong Kong, China, Brunei, Cambodia, Cook Islands, Fiji, Indonesia, Malaysia, Singapore, Tonga, Vietnam, Thailand . and Western Samoa ) Interflora Pacific Unit is a retailers' co-operative
- "Interflora agrees to 3i takeover". BBC. 2005-01-23. Retrieved 2016-01-25.
- "FTD Group, Inc. Announces Agreement to Purchase Interflora Holdings Limited | Business Wire". www.businesswire.com. Retrieved 2016-01-25.
- "About". Interflora Pacific Unit Limited. Retrieved 2008-05-20.
Interflora Pacific Unit Limited was formed in New Zealand in 1952 and is a Co-operative Company registered in New Zealand under the Co-operative Companies Act 1996. It is owned by its member florists, 200 in New Zealand and 120 overseas members in Hong Kong, Singapore, Malaysia, China, Myanmar, Indonesia, Brunei, Cambodia, Cook Islands, Fiji Islands, Tonga, Vietnam and Samoa,