I've read that too, but Home Depot only had the one kind at the time I bought them, so I bought 3. For some reason, a bunch of clover is growing in various spots in the yard, which seems to have attracted a fair number of bees to help pollinate stuff.
I'd make a lousy farmer, but it's kind of fun trying to grow stuff. Heh.
Bees are awesome. And clover adds nitrogen to the soil Great stuff. Even growing something means fresh, non-poisoned etc.