Ontario Today's resident gardener returned to Rideau Hall for the Garden Gathering when the National Capital Commission opened its gardens and greenhouses to the public.

Ed Lawrence was the chief horticultural specialist to six governors general, from Jules Leger in the 1970s to Adrienne Clarkson in 2005.

He and the CBC's Hallie Cotnam met up with Rideau Hall's current manager of grounds and greenhouses, Mark Burleton, for a tour, which you can see in the photos above.

Ed joined Ontario Today from noon to 1 p.m. ET Monday then he joined CBC News for a live chat. You can see a recap of the chat below.