[header] How to pick the right mulch [title] Use fallen leaves for organic gardening. [step] Leaves are by far the best type of mulch for organic gardens, by virtue of the fact that they improve soil health as they compost into your garden soil, allow water to get through, and prevent weeds from popping up. They are also freely available if you have deciduous trees in your backyard. 
If you do not have any deciduous trees in your yard, you can always ask your neighbor for a bag of fallen leaves in the fall. [title] Use bark, shredded wood or wood chips to prevent weed growth.