Inorganic Mulch
Mulches are available commercially in many forms.
The 2 major types of mulch are inorganic and organic. Inorganic mulches
include various types of stone, lava rock, pulverized rubber, geotextile
fabrics, and other materials. Inorganic mulches do not decompose and do
not need to be replenished often. On the other hand, they do not
improve soil structure, add organic materials, or provide nutrients. For
these reasons, most horticulturists and arborists prefer organic
mulches.
Organic Mulches
Organic mulches include wood
chips, pine needles, hardwood and softwood bark, cocoa hulls, leaves,
compost mixes, and a variety of other products usually derived from
plants. Organic mulches decompose in the landscape at different rates
depending on the material. Those that decompose faster must be
replenished more often. Because the decomposition process improves soil
quality and fertility, many arborists and other landscape professionals
consider that characteristic a positive 1 , despite the added
maintenance.