The range is split into vegetable and flower offerings across a two-stand display. Both selections include modern strains and traditional favourites that have all received the Award of Garden Merit.
There is no cross over with existing lines. The range can be treated as a stand-alone display or integrated into a larger offering of Mr Fothergill’s seeds, which celebrates its 40th anniversary in 2018.
Mr Fothergill's joint managing director David Carey said: "We are delighted to be working as the preferred seed partner of the RHS. The packaging and display that we have developed together will really lift this range in-store and will perfectly complement our existing offer.
"We look forward to seeing the Mr Fothergill’s RHS Award of Garden Merit range enter stores in August and we are already working with the RHS to develop exciting product concepts for future release."
Mr Fothergill's David Turner said 2017 has been a positive year after a static 2016.
The RHS range launches in retailers from 1 July.