Roberto Burle Marx quotes:

A garden is a complex of aesthetic and plastic intentions; and the plant is, to a landscape artist, not only a plant - rare, unusual, ordinary or doomed to disappearance - but it is also a color, a shape, a volume or an arabesque in itself.

I did a salad, but I didn't do a garden.

A garden is a result of an arrangement of natural materials according to aesthetic laws; interwoven throughout are the artist's outlook on life, his past experiences, his affections, his attempts, his mistakes and his successes.