The listing marks the entry of fertiliser and plant food supplier PlantGrow into the gardening care market beyond Norfolk, where Steve Suggitt and Richard Beales launched the product in 2016.
Suggitt said: "Blue Diamond is one of the market leaders and we are delighted that PlantGrow will be on sale at so many quality garden centres across the UK. Working with such a well-established and respected market brand can only be of benefit to a young enterprise such as ours."
PlantGrow is derived from condensed, natural plant tissue and is chemical free, and is drawn from the residue of the agricultural anaerobic digestion, bio-fuel process.
PlantGrow is suitable for flowering plants, roses and shrubs, including hanging baskets and tubs, to vegetables and lawns. It is available in both liquid and solid forms. The liquid is a plant food to be used throughout the growing season, whilst PlantGrow in solid form acts as a growing medium and soil conditioner.
Blue Diamond managing director Alan Roper said: "At Blue Diamond we look to bring to customers products that add to the range of choice we can offer, knowing how keen our customers are as gardeners. PlantGrow is new onto the market, and is interesting because of its unusual properties that distinguish it from other plant foods. We look forward to customer feedback over the Spring and Summer."