Policy committee member and landscape planning consultant Ian Phillips said he was "cynical" over whether any money would go on landscaping through the scheme, which is housing minister Grant Shapps's plan to offer councils in England extra money for every newly-built home as part of a Government programme aimed at easing housing shortages.
Under the New Homes Bonus, the Government will match the council tax raised on each new home for six years to incentivise house building, which is at its lowest level since the 1920s.
Phillips said the new scheme may not be good for landscapers: "Planting around housing should be part and parcel of planning consents anyway. It should not be a matter for public expenditure separate to the building itself.
"That said, contributions over and above what developers produce may be used for anything the local authority decides to spend its money on, such as bin collection rather than open space, particularly as open space requires ongoing maintenance. I'm fairly cynical."
Phillips said he was still waiting for the new Government to show its commitment to being the greenest ever. He added that the Decentralisation and Localism bill due out in November, which will abolish regional spatial strategies and is intended to give councils, neighbourhoods and local communities greater control over housing and planning decisions, would determine the Government's view of green space.
He said the Landscape Institute will campaign to make sure landscape provision is included in any new planning regulations because it will not come voluntarily from house builders.
But amenity grower Johnsons of Whixley director Andrew Richardson was more hopeful about the New Homes Bonus scheme. "This has to be good for horticulture. There is still a shortage of housing and one way or another the Government has to get it going," he said.
"We're starting to see the very first signs of house builders starting to move a little bit. Public sector work has dropped off but house building is starting to go again."
He said the recession-led collapse of house building over the past two years had caused "major problems" for amenity growers. The feeling at HTA ornamental meetings was that the new Government was promising much on green space "but it's all about the delivery", he insisted.