I grow wheat grass for my cats.  I buy whole grain wheat by Arrowhead Mills
available at most any healthy food store.   It looks like rice in a bag.  The
key to growing it is to soak the dirt in water first.  I put some dirt in a
bowl, run a trickle of water on it until it's very very wet.  Then let stand 5
minutes, and then drain off the excess water.  Get a shallow container (I use
those clear plastic things you put underneath a potted plant.  I punch some
holes in it for drainage.  Then put about an inch and half of the wet dirt.
Then put a couple tablespoons of the wheat grains on top, then cover with just
enough of the potting soil to cover the wheat grains (about 1/4 inch or so).
Put this in another dish for drainage.  It should start sprouting in about 3 or
4 days.  Once it starts sprouting, water it well.  That's all there is to it.
Should last a couple weeks.  I find putting it in the fridge at night helps it
last longer.  I've been giving this to my cats for 4 years now and they love
it.  

Lauren
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See my cats:  http://community.webshots.com/album/56955940rWhxAe
Raw Diet Info: http://www.holisticat.com/drjletter.html
http://www.geocities.com/rawfeeders/ForCatsOnly.html
Declawing Info: http://www.wholecat.com/articles/claws.htm