UPM Tilhill scooped the National Monument Award for its work on the Armed Forces Memorial in Alrewas, Staffordshire.
The firm planted 57 Holm oaks - each valued at £2,500 - to offset the stone monument, as well as laying 7,500sq m of turf.
UPM Tilhill district manager Richard Sochacki said: "It is wonderful to help bring to fruition such a grand design that draws together landscape and sculptural elements to such powerful effect."
Winner of the Best Newcomer Award Mulberry Grounds Maintenance impressed judges with its work on Turville Court, Oxfordshire.
Mulberry managing director Anthony Ussher said: "It's a fantastic achievement. We set Mulberry up three years ago, and only became full members of BALI earlier this year. This is a great tribute to the Mulberry team."
The Company of Landscapers was recognised in the HW-sponsored category for landscape contribution to education.
The firm constructed the Abbotsbury Swan Maze, in Dorset, using locally grown willow. Six egg-shaped igloos mark the entrance to the maze, which leads to a central dome with a sky hole. Staff had to learn basket-weaving to carry out the work on the attraction.
The Design and Build Award went to Graduate Gardeners for its work on Moss Bank Farm, Cheltenham.
Also receiving a special award was Tom Hedges, who works for Sentry and was given the Geoffrey Chalk Memorial Fund travel scholarship. Hedges will travel to California to research the use of natural swimming pools and green roofs in mitigating the effects of climate change.
Industry maven John O'Conner's 40 years working in the sector meant he was the perfect choice for BALI's Recognition Award.
As chairman of John O'Conner (Grounds Maintenance) and BALI national chairman 2006/07, O'Conner's commitment to the industry was recognised through the prestigious award.
In the main categories, the prestigious Grand Award went to Willerby Landscapes for its work on Liverpool's Chavasse Park. Tony Benger Landscaping scooped Soft Landscaping Over 1ha for the Longmore and Lister Gardens project in Dorset. Quadron Services' grounds maintenance in the Royal Borough of Kensington & Chelsea was also recognised.
Landcraft Projects was praised by judges for its work on the Riverside Park, in Rhondda Cynon Taff, South Wales. The firm scooped the Land Renewal and Regeneration Scheme Award.
- See December's Landscape Review in next week's issue of HW for a full list of award winners.