The company added an extra four staff to its original team of six to carry out work at Kent's Thanet Earth project.
The scheme included planting 15,000 trees and shrubs around 16ha of grassland on the grounds of Thanet Earth.
Phase one of the planting is now complete and the firm will continue working on preparing the soil for further seeding in the autumn.
Hawthorn, hazel, dogwood and trees such as maple, beech and cherry are among the native species added to the landscape, along with a grass mix that con-tains both native grass and wildflower seeds.
Managing director David Eyre told HW that he was delighted to have won the contract to carry out the work.
"We had to turn the job around really quickly - it was just seven weeks from our first meeting with Thanet Earth to the project's completion," he said.
"It is one of the biggest projects we've completed in terms of area and planting."
BALI member Twig sourced its trees and plants from Palmstead and Wyevale Nurseries.
"Everyone is so negative at the moment about the economic climate but we have taken the stance that there is work out there and we are going to go out and tender for it," said Eyre.
The firm is currently carrying out a maintenance contract for the Highways Agency and is to undertake clearance and conservation work at a new primary school being built in nearby Sissinghurst, Kent.
"We are an expanding team and I am extremely proud that we have successfully carried out such a large-scale task both on time and on budget," explained Eyre.
"Our philosophy is always to landscape with conservation in mind and this is exactly what we are doing at Thanet Earth.
"The trees, shrubs and chalkland will not only make a real difference to the site's appearance, but will also create suitable habitat for an abundance of wildlife," he said.