The event, held at The Brewery in London saw Frogheath take the overall award for its project which involved landscaping the gardens surrounding a rare timber and brick 16th century sheep barn in the Brede Valley.
Another big winner at the event was Arun Landscapes which scooped three awards - for best project £20k to £35k, best project £100k to £250k and best hard landscaping project.
Frogheath's winning scheme, also the winner of the Project Value over £250,000 category, included features such as a formal lawn punctuated with clipped Quercus ilex and exuberant borders, secluded areas enclosed with stilted hornbeam hedges, a walled potager with a contemporary fruit arbour, dipping pond and rustic raised beds.
Frogheath also created an orchard under planter with a wildflower meadow and a gentle walk through a nuttery of local filberts and Kentish cobs. To promote sustainability all bricks, tiles and Yorkstone are reclaimed, all lighting LED and a rainwater harvester provides irrigation.
The judges commented, "It is a fabulous piece of landscaping work that has exquisite detailing especially within the planting. It is simply stunning fitting the house and its surroundings perfectly."
Other category winners included Arun Landscapes, RG Landscape & Construction Ltd, James Bird Landscapes, Timotay Landscapes, Big Fish Landscapes, Planet 14 Landscapes and Landform Consultants.
The awards were sponsored by Bradstone and hosted by landscaper and horticulturist Chris Collins and HTA head of horticulture Raoul Curtis-Machin.