leaf mould 
noun [mass noun]
1Soil consisting chiefly of decayed leaves.Enrich the soil with compost and leaf mold, periodically apply organic fertilizers such as fish emulsion, and make sure plants get adequate water....
- These are not gross feeders, but elegant plants of open woodland, happiest in humus rich soils with an annual mulch of compost or leaf mould.
- Here's how: Amend soil with compost or leaf mold and a bit of horticultural sand.
2A fungal disease of tomatoes in which mould develops on the leaves.
- The fungus is Fulvia fulva (formerly Cladosporium fulvum), subdivision Deuteromycotina.
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- Chatham House Rule
- Chatham Islands
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