Some Types of Organic Mulch

This type of mulch once used to be living material and as such will decompose over time. During their decomposition vital nutrients will be added back into your soil. However you may want to avoid using organic mulches if you have rodent problems. Some common organic mulches are:

   1.

      Compost - Mulches and feeds the soils as it decomposes. This mulch is free if you have access to your own compost heap. Apply at a depth of 1 - 3 inches.
   2.

      Pine Needles - Commonly used with acid soils. Cheap, looks great and allows water to pass through freely to the soil below. It decomposes quite slowly however. Apply to a depth of 1 - 1.5 inches
   3.

      Straw - Provides great insulation, water penetration and weed control. Care should be taken that straw does not contain weed seeds itself. Apply to a depth of 6 - 8 inches.
   4.

      Grass Clippings - Readily available and decomposes quite quickly adding nitrogen back into the soil. Try not to apply too fresh as it can heat up quite a bit and possibly cause damage to your plants. Apply to a depth of 1 inch.
   5.

      Newspaper - Provides great weed control and is readily available. Apply another mulch on top to keep it in place. Apply in 2 layer sections.


source : hydroponic