imaginary line defined by the branch spread of a single plant or group of plants.

drip line (Wikipedia)

Drip line may refer to:

  • Nuclear drip line, the lines beyond which protons or neutrons leak out of nuclei
  • Tree drip line, the area defined by the outermost circumference of a tree canopy where water drips from and onto the ground
  • Drip irrigation line, where the tubes and hoses are laid
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