Seed coat, embryo, cotyledons
The seed protects a living embryo and stored reserves before favorable conditions support renewed growth. Radicle and shoot-axis development establish the first root and shoot systems.
EmbryoCotyledonRadicleHypocotyl
Development Deep Lab · Germination
Germination is a sequence, not a pass-or-fail moment.
Track the seed from water uptake through metabolic reactivation, radicle emergence, cotyledon opening, and early seedling establishment. When emergence fails, identify where the sequence stopped before assigning a cause.
Imbibition → emergence → establishment
Imbibition: water uptake begins the transition out of quiescence.
Metabolic restart: respiration and reserve mobilization increase.
Radicle emergence: the primary root axis exits first.
Cotyledon opening: the young shoot transitions toward photosynthetic growth.
Record conditions through time
- Seed condition and storage history.
- Imbibition time and time to radicle emergence.
- Root-zone temperature and moisture consistency.
- Time to cotyledon opening and first true-leaf development.
Failure does not identify one cause
Seed vigor, viability, moisture, oxygen, temperature, handling, and time can all affect emergence or establishment.
Evidence boundary: a shell remaining attached or a seed failing to emerge is not, by itself, proof of one environmental error.