When looking through the 37 "Nasturtium" images at Acclaim Images.com this Watercress Growing on a Spring Water Fed Chalk Bed in Hampshire England UK was a favorite.
All of their pictures are hand picked, availiable in a number of formats, and you can even get custom prints and posters.

Description:
Watercress Growing on a Spring Water Fed Chalk Bed in Hampshire England UK
Watercress growing on a spring water fed chalk bed in Hampshire England UK. Watercress farming in Alresford Hampshire southern England UK

Some related terms for more images:
harvesting,  southern england,  beds,  microphyllum,  leaf,  alesford,  nasturtium aquaticum,  cultivation,  cress,  cutting,  business,  farm,  plant,  peter titmuss,  production,  hants,  watercress,  uk,  plants,  hampshire,  salad,  vegetable,  food,  farming,  leaves,