Quick Hedge is supplying hedging and the garden will feature a round-headed rampion as well as other rare Sussex flowers.
Architectural Plants commercial director Guy Watts said the move to Brinsbury allowed the company to expand and offer a larger variety of options to its retail customers. The firm has expanded its tropical nursery, grown its garden design business and reformatted its website, adding videos.
Watts has also created charity Streetscape to provide apprenticeships for unemployed youths aged 18-35, using horticulture as a way to build their skills and help them find work. Streetscape will also participate in creating Williams' garden.