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To answer your question, we decided to learn a little bit about grass itself. However, our first, eager visit to FreshCutGrass.Com didn't pan out. Turns out they're a bluegrass band from Kentucky. That's okay, though; when we headed to Yahoo!'s Botany category, we discovered plenty of intriguing facts about grass. While good old lawn grass may not grab the same attention as colorful azaleas or mighty redwoods, it's a fully functioning plant in its own right. This means it has chlorophyll, the green pigment that gives plants their color and
enables them to carry on the process of photosynthesis. As it turns out, the molecular structure of the chlorophyll is similar to that of the "heme-" portion of hemoglobin (i.e., blood), except that the latter contains iron in place of the magnesium found in chlorophyll. Now fresh cut grass doesn't smell exactly like blood, but you can see the relationship. They both smell sharp, acrid, and a bit metallic. That's because they share a similar molecular structure, based around magnesium (chlorophyll) or iron (hemoglobin). So there you have it. Now, just make sure you take time to stop and smell the chlorophyll.
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