Laking Garden is one of the more seasonal corners of Royal Botanical Gardens, known especially for irises and peonies. It sits on the Burlington side of the RBG system, so it is best treated as part of a garden-and-trails outing rather than a stand-alone city sight.
Timing matters here. Late spring and early summer bring the strongest display, while other parts of the year are quieter and more useful for a gentle walk than a spectacle. If flowers are the point of your visit, check the garden's current bloom notes before going.