nurse log

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Definitions from WordNet

Noun nurse log has 1 sense

nurse log - a large decomposing tree trunk that has fallen, usually in a forest; the decaying wood provides moisture and nutrients for a variety of insects and plants
--₁ is a kind of log

Definitions from the Web

Nurse Log

Definition: A fallen or dead tree that serves as a substrate for new seedlings and plant growth, providing nutrients and moisture as it decays.

Examples:

The nurse log in the forest supported a diverse ecosystem of mosses, fungi, and small plants.
Seedlings sprouted from the decaying nurse log, taking advantage of its rich soil and moisture.
The forest floor was covered in a carpet of vibrant green plants, thanks to the nurse logs scattered throughout.