The company won the contract recently to look after all the parks and seafront flower beds in the East Sussex districts. It will work with Hastings Borough Council, Rother District Council and AmicusHorizon housing association.
"We have been awarded this grounds maintenance contract, one of the largest in the country, saving the partnership over £500,000 a year over the 10-year life of the deal," said operations director Michelle Maybury of the combined contract worth more than £2.1m a year.
"There was an enormous amount of work in reviewing the needs of all three clients and devising an operational solution that allows us to deliver a good service to all, but at lower cost to taxpayer and residents.
"We have come up with a neighbourhood-team approach that reduces travel time, allows our staff to focus on their local patch and enable them to be more responsive to local needs."
Hastings leader Councillor Jeremy Birch said: "By forming a joint partnership with Rother and AmicusHorizon we have been able to realise savings through economies of scale and smarter ways of working.
"This is the first time we have procured the grounds maintenance contract in partnership. The new deal brings financial benefits of £5m for the partnership. That is great news for the residents of Hastings and great news for our partners."
Lead member for parks councillor Emily Westley said: "Due to the size of the contract and our partnership approach, we attracted the best companies working in grounds maintenance to tender."
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