Former Suttons Seeds marketing director David Arnold was running the campaign.
GIMB chairman Keith Nicholson from Westland Horticulture said: "We are delighted that Holly and her team is working with us to help take the campaign forward in 2016 and beyond. They bring with them a lot of experience and enthusiasm from the various clients and roles that they have had."
He added: "2015 has seen a successful programme of Love the Plot roadshows throughout the country enabling us to take the message to a wide audience, supported by additional activity online and in the media. The campaign is supported by retailers, growers and suppliers but there is room for more – as its success is governed by the funds it is able to raise. It is about growing the market as a whole – which is in the interests of all businesses no matter their size."
Garland said: "This is a fantastic campaign with masses of potential. The support that the industry has given to the campaign to date is inspirational and we are really looking forward to working with everyone to take it to the next level.
"Key for us will be taking the campaign forward to achieve even more cut-through in a noisy, competitive consumer market. To that end, we have a variety of exciting activities in mind and look forward to bringing them to fruition with the GIMB team."
Love the Plot You’ve Got is designed to help and inspire 30-45 year olds who have access to a garden or outdoor space but don’t make great use of it. Industry research has revealed that skills and knowledge once handed from one generation to another are being lost, and that while lots of people want to improve their outdoor spaces and environment, a lack of knowledge and confidence is holding them back.