Straw has some potential problems that must be recognized before it is used. On the other hand, it is cheap and effectively suppresses weeds and reduces soil water losses. As a winter mulch, it protects tender roots from cold temperature injury. Pine needles Pine needles have a pleasing appearance and acidify the soil around acid-loving plants. They normally are not available commercially but can be raked up from around pine plantings.
Pine needles decompose slowly, are resistant to compaction, and are easy to work with.
They provide excellent protection around newly set or tender ornamental plants. If left on year-round, pine needles should be renewed annually. Shredded leaves Leaves that have been shredded with a composting mower are sometimes used as a summer mulch. If not shredded finely enough, however, the leaves tend to mat together and form a barrier that blocks free water and oxygen movement into the soil. For best results, allow leaves to partially rot before using them as a mulch.