These sites will provide contractors in London and the South East with improved access to the company's topsoil. The company said it made the move after requests from landscapers, ground workers and architects in the London area for improved access to British standard topsoil.
The new Heathrow site will accommodate the London and London West areas, working in partnership with building materials group Brett Aggregates. The new Basingstoke site - also referred to locally as Little Bushy Warren - will provide coverage for the Hampshire and South Coast regions. Green-tree will distribute the Pro-Grow brand of British Standard topsoil from this site operated by Veolia, a long standing partner of the business.
The topsoil at both sites conforms to BS3882:2015 standards, independently tested by Tim O'Hare Associates.
Mark Wood, Green-tree business manager, said: "The addition of the two new supplier agreements sites reinforces Green-tree's commitment to the industry. We have invested heavily in both time and resource to achieve a premium British Standard topsoil that can be accessed by contractors in the London and South East areas.
"The Green-tree and Pro-Grow brands are growing from strength to strength with landscape contractors choosing the brands over other topsoil options knowing that their finished project will produce the result and plantings that their client envisaged."
Brett Aggregates added: "The Green-tree brand of topsoil complements our existing product range and is a natural addition to our Heathrow production site. We are impressed by the quality of topsoil currently in production and proud to partner such a well-respected brand such as Green-tree."
Raquel Carrasco, organics and technology director at Veolia, said: "We have worked with Green-tree on many high profile projects and always found their responsiveness and professionalism outstanding.
"The Veolia Pro-Grow British Standard topsoil currently being distributed by Green-tree, is manufactured using Veolia Pro-Grow Pas100 compost and conforms to all the necessary industry standards. We look forward to working closely with the team to distribute to the South East areas a consistent, high quality supply of topsoil."