Deakinlock Garden Design has been trading for nine years, winning BALI and other awards, as well as medals at RHS Chelsea Flower Show.
Chris Deakin ceased to be a director of the company on 23 October. A statement released by the partnership today said he will continue to work on garden design projects in East Anglia.
"Jason and I had a great, complementary partnership but felt we had reached a fork in the road in our business together," he said. "We are both excited about the new chapters in our careers, and focusing on our passions within this wonderful industry."
Lock told Horticulture Week he is winding up current jobs and moving on in the coming weeks. He has been sworn to secrecy on his new role until his new employer announces the move in the next few days.
He said: "I’m really excited about it. It will stretch me and it’s a new area of work for me. I’m really looking forward to it.
"The last nine years have been a fascinating journey for Chris and me," said Jason Lock. "Starting a business at the height of the recession was tough, but we worked through it and are parting with some great projects under our belt, that we are both immensely proud of, not least winning a Principal BALI Award, being shortlisted for the SGD Awards and Gold and Silver medals at RHS Chelsea 2010 to 2014.
"We both now want to explore new opportunities and the time feels right to do it now."