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A. Oak leaves make a great mulch but not too heavy a layer. The trees have shed a plentiful supply this year and they can be put to good use in the landscape.Most plantings can be mulched with oak leaves including rose and vegetable gardens. An inch or two over the roots is all you want to add.alkways can be mulched as thick as you want. Leaves make good additions to the soil too, but they are best composted first. When fresh oak leaves and other types are turned in with the soil, they tend to bind up nutrients plants need for growth.
Most, however, have one thing in common: they grow best with a fairly low pH. Some may be able to tolerate neutral or near-neutral conditions, while others -- like the pin oak -- grow exclusively in acidic soil. High pH in the soil around oak trees typically leads to a condition known as chlorosis.ron Chlorosis. Chlorosis occurs when a plant lacks sufficient chlorophyll to carry out photosynthesis. One particular type -- known as iron chlorosis -- is often caused by iron deficiency due to high soil pH in the oak tree's soil. Chlorosis causes yellowing of the leaves.