As reported in the Evening Times, Pollok Children's Centre has been targeted by thugs five times in just one year.
But City Building tradesmen James McGowan and John Cook, who were sent out to repair the damaged windows, stepped in to fix the kids' Eco Greenhouse.
Councillor Paul Carey, chairman of City Building, said: "We should never under- estimate the value of learning aids like the Eco Greenhouse for children.
"Providing resources where children can learn and play is hugely valuable to their early years education.
"Our City Building tradespeople are happy to have been able to repair the damaged windows and restore the Eco Greenhouse so that the youngsters can continue to enjoy the resource."
The Eco Greenhouse is made from old two litre soft drink bottles held together with bamboo canes.
It had been targeted by vandals who damaged the bamboo poles and tore off bottles.
Joiners James and John returned to the children's centre the day after fixing the broken windows and took extra supplies with them.
They found additional plastic bottles to replace those too damaged to be reused in the structure and sourced new bamboo to reinforce the greenhouse.
Head of centre Noelle Harvey has made several attempts to deter vandals.
She wrote letters appealing to the local community to help protect the nursery and had the children make signs reading, 'Please Leave Our Nursery Alone,' to be pinned up around the fence.
But, so far, nothing has deterred local neds from repeatedly targeting the centre.
Noelle said: "We're delighted that James and John from City Building were able to lend some manpower to help repair the damage done to the nursery.
"City Building has always been very helpful and supportive with any maintenance we have needed and we are thrilled that they have been able to help us in this instance as well."