Cost: $720 + HST. www.cog.ca Zenscaping: japanese garden design using water, with Rebecca Cragg, Feb. 18, 7 p.m., Greater Ottawa Water Garden Horticultural Society, Greenboro Community Centre, Room A, 363 Lorry Greenberg Dr. Fee: $5. 613-592-8142. It’s going to be a big year for Brooklyn Botanic Garden. Not only is the garden marking the centennial of its serenely beautiful Japanese