I have a decorative grass that I want to know about. This looks more like a bush than grass; it stands about 3' or just aittle more. It has purple thistles, & long thin blades that grow closely together. Can this be identified?

Please post a photo.

Or look at these --

Decorative Grasses (https://www.google.com/search?q=decorative+grasses&client=firefox&hs=ZQ6&rls=org.mozilla:en-US:official&source=lnms&tbm=isch&sa=X&ei=LrI3Utr8E-SIygGkh4DQCw&ved=0CAcQ_AUoAQ&biw=1024&bih=596&dpr=1)

I recently purchased a plant/bush, that was described by the store as grass. It currently stands about 3 ft high, and has long, green reeds, ending in purple thistles. This stands in a round cluster of reeds/thistles. Over a long period if time, a type of 'core' will grow in the middle. It's an attractive plant/bush in its early first years. I'd like to learn what it is so that I will know how to care for it.

Picture would sure help.

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The only thing I know that grows that tall would be pompas grass which can grow anywhere from 3' to 12'

Pampas Grass - MediaMaimbau (http://dofra-newsholic.blogspot.com/2012/01/pampas-grass.html)