In a statement, Mr Pemberton said: “With deep regret the directors have decided to cease trading at the end of this year.
“The door is not yet closed, but it is closing, while the need for training and employment for those left behind is getting greater.
“We would very much like to find a partner to continue and serve that need and we are busily working to do that.”
Mr Pemberton, who has an autistic son, started the not-for-profit enterprise in 1996 on a former council nurseries site.
He said: “It’s been like pushing water uphill. Costs are going up, income is shrinking. We have lost some grounds maintenance contracts.
“We are solvent today… but we knew we would soon be trading insolvently.
“It’s a cruel twist because more and more people are on the spectrum or with ADHD [attention deficit hyperactivity disorder].”
More than 1,000 people were trained at the centre and several had gone on to start their own garden businesses, Mr Pemberton added.
The firm had a £61,000 surplus of assets over liabilities, according to its latest accounts for the year to the end of 2024.
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