Answer: The leaves of eucalyptus trees contains volatile oils. Though I have not heard specifically that they should not be used in compost piles, it may be that these oils cause the leaves to break down very slowly. It is possible, too, that these oils can have a harmful effect on other plants (if the oils survive the composting process intact). To be on the safe side, I would avoid using them in your pile. Other sources of carbon include straw, sawdust or wood shavings. Is there a farm nearby that would give you their spoiled hay? Or a lumberyard or carpentry shop with excess wood shavings?
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