Direct answer

Transplant when the game signals a planter upgrade need (stage change). Ignoring it stalls growth; transplanting early wastes space but doesn't break the plant.

Transplant triggers

  • Stage change to a growth stage that outgrows the pot.
  • Plant Info showing a larger required planter.
  • Wrong-planter warnings in the soil/planter UI.
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Evidence note

Transplant mechanics are observed in 1.0; exact thresholds come from Plant Info records.

OBSERVED

Community: planter reuse fails with soil-composition warnings — separate from transplanting itself.

How to grow
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Transplant and planter records are shared.