BALI representatives joined members of the Welsh Assembly Government and students at the event last month.
Environment Agency representative Bob Vaughan shared information about sustainable urban drainage systems, while Marshalls group marketing director Chris Harrop opened the day with a presentation on sustainability in hard landscaping.
Vaughan said: "The thing I took away from the day was the importance of the role horticulture will play in helping us adapt to our changing climate. In both our rural and urban environments, the way we use plants will be a vital ingredient in reducing flooding and temperature extremes."
The event was complemented by horticulture students building elements of a sustainable garden, for which they had created designs and plans earlier in the term.