I bought a set of mulching blades last year for our lawn tractor. I was suprised when I took them out of the package. They weren't sharp at all. To my suprise they do a great job mowing. I'm still scratching my head. I've always sharpened blades.
Mower Blades
How often do you sharpen your rideing mower blades? This hit me today when moweing neighbor yard I havent sharpen them in 3 or 4 years.. 
