Precedents: Planting Design

Thinking about how to reintroduce aquatic vegetation along the South Bank, without it being perceived as 'scruffy' or looking like a token gesture, I came across these images of the Jardin Botaniqué de Bordeaux designed by Catherine Mosbach.

Although these forms may be too geometrically bold, the idea of plant filled lagoons of varying size (and shape?) seemed quite interesting.