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What is a flower garden called that makes a picture or spells words?

I'm looking for the word that describes how flowers are planted or arranged in a garden to make a picture or spell out words. It's usually a large garden display, and the flowers form words (like at the end of a city and the flowers would spell out the name of the city, or the flowers would make a huge clock face). What's that called?

Public Comments

1. Topiary. http://search.yahoo.com/search?p=topiary&fr=ush-ans