The site, which was formerly a 2.2ha garden open to the public, has seen Trelawney finalise plans to build a garden centre on it for almost a decade.
Planning and financial delays have put off the start of building, but Danning said work was due to have started this month on revised plans for the building, which was to have nestled into a hillside.
The original plans from 2004 were for a £6.5m garden centre covering 4,645sq m along with gardens.
Danning and partner David Symons also own Trelawney@Ashford.
Danning said: "We are building Probus ourselves. Slow worms haven't hibernated yet so we've had to delay by a few weeks. We've also made some changes to the design."