Quote:
Originally Posted by Darkman
I mainly use Oak tree leaves (small ones like live oaks) that break down in about a year. I mulch 4"-6" thick and I make sure I water thoroughly first.
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You are making compost in-situ. Be aware that deciduous oaks disburse chemical compounds into their leaves in the Fall that can be toxic to the roots of some annuals and a few perennials -- basically their natural competitors.
Sounds like your soil is rich in microbes. Before spending time and money on adding something, it would be prudent to get a soil test kit from the your county Agricultural department. When you send in the samples, be sure to have them test for spore counts of mycorrhizae along with the standard tests. Typical cost is $40 to $60.