Potato Review Group


Important stages of development

Further information


Important stages of development

  1. Knowledge of stages of tuber development is important for crop management.
  2. Tuber development cannot be judged from canopy development.
  3. Direct examination of below-ground development is required.
  4. Stages of tuber development are shown below.
  5. In a crop with even development, plants should reach these stages at similar times.

Stages of tuber development


Stage 1: stolon tips hooked and extending (Hook).

Stage 2: onset of stolon tip swelling, the first visible stage of tuber development (Os).

Stage 3: described in the industry as “tuber initiation” but this is a misnomer as the tuber has already been initiated.

Stage 4: onset of tuber bulking, tuber >10mm diameter (Ob).


Further information

See Crop Growth Patterns for presentations which provide introductions to various aspects of potato physiology.


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