The boys, aged 15 and 16, built on the legacy left by the green-fingered volunteers who created the garden at Hampden Primary in the city's South Side.
They mended damaged benches, painted woodwork and carried out maintenance work at the school which teaches children with complex learning needs.
In 2010 the school was forced to move to its current site in the Gorbals following a fire at its Toryglen base.
At the time the garden at the new building was not suitable for pupils to play in.
But Action for Children Scotland worked with local young people to help them transform the garden into a safe and enjoyable place for pupils.
Now, the children and young people's charity has returned with a group of teenagers who are taking part in an Inspiring Scotland Challenge designed to help young people make a positive difference in their local community.
Even when rain stopped work outside, the 10 young men painted inside the school building as part of their six-week challenge.
Andrew Ramsay, 15, of Govan, has been involved in the programme.
He said: "We have all been hard at work in the garden and, whenever the rain starts, go straight inside and start painting walls.
"I am really enjoying the challenge and working with the rest of the guys. The skills I have developed will definitely be useful in the future - I am due to start a construction course at college at the end of the summer so this has all been good practice."
The youngsters also took part in a Barclays Money Skills course, to help build their financial expertise, and PX2 training, which helps young people deal positively with situations in their life by raising confidence and self-esteem.
The group was rewarded for its hard work with tickets to see an Olympic football match at Hampden.
Tony Scally, group manager at Action for Children Scotland, said: "We are very pleased to be able to return to Hampden School and give the garden a general tidy-up.
"We have not had the best weather this summer but the young men have not let this dampen their spirits and I would like to congratulate the group on all their hard work, commitment and creativity.
"As well as making a positive difference to the area, they have developed skills and gained experience that will stand them in good stead for the future."
Councillor Stephen Curran, executive member for Education and Young People at Glasgow City Council, said the youngsters were an "inspiration".
He added: "I visited the school recently and the new garden is a wonderful addition for the pupils, teachers and their families to enjoy when the weather allows.
"Well done to everyone involved and I know the skills the youngsters have learned will stand them in good stead for their future careers."
matty.sutton@ eveningtimes.co.uk
