Straw. Smells like the country. Reminds me of hoe downs, agricultural fairs and the Wizard of Oz. Relatively cheap. Great to use for mulch. NOT!!! Read this and don’t use straw, hay or any other additive you don’t know for sure how it was made or grown unless you want things in your garden like clopyralid and aminopyralid; herbacides that cause vegetable plants to be stunted, distorted or not to come up at all. Today I managed to get most of it out of my vegetable garden. What a waste!