Doesn't need to be "curated". Could be "wild" flowers, shrubs, grasses, and trees in a more natural setting along a path.In respect of what most Botannical Gardens are known for, I don't think there's a case for that.
Wilket Creek Park, the area in question, is entirely natural but for the Bike Path.
I wouldn't want to see that become 'curated' gardens.
I'm all for expanding TBG, but the logical spot is the Church/school property to the south along Leslie; after which one could examine expansion on the Bridle Path side, though that's some seriously expensive real estate.