Gardening in Calgary - 1 Session Each session is 2 hours long and will run from 6:30-8:30pm at the Dalhousie Community Association. The details for each topic are provided below: May 22 – Annual Flowers and Edible – Containers and More June 19 – Trees and Shrubs of Calgary – The Framework of the Garden August 7 – Perennial Gardening – Function and Habitat in the Garden September 11 – Herbs – for All Seasons and Reasons