BDO LLP is the fifth largest global accountancy network and employs more than 300 people in Manchester and Liverpool.
Petal & Co’s brief is to highlight the strength of BDO’s expertise and sector insight across the region.
The account will be led by Jessica Wilkinson, who started the agency last year following three years at Weber Shandwick Manchester.
She will be supported by marketing communications manager Sian Collister, who held marketing manager roles at MoneyThing and IMGold.
Ed Dwan, partner and head of BDO in the north west, said: “We weren’t just looking for technical expertise – it was about finding a team that really understood our market and people.
“The team at Petal & Co. ticked every box. We’re pleased to have them on board and are looking forward to them playing a part in our growth strategy.”
Wilkinson added: “We set out to work with ambitious businesses and advisers who use their expertise to facilitate growth for clients and in their own business.
“The quality of the talent, research and clever insights being produced by BDO will ensure this campaign, which is already seeing good results, will build strong momentum over the coming months.”