Cannabis is typically a _____ day flowering plant.

Question

BlackTom AI · Accepted Answer

Cannabis is typically a short-day (long-night) flowering plant.

1. Relevant knowledge points and concepts
- Photoperiodism: many plants use daylength (photoperiod) to time flowering. Short-day plants flower when the night exceeds a critical duration; long-day plants flower when nights are shorter than that critical duration.
- Florigen and phytochrome systems: uninterrupted dark periods allow accumulation of signals (e.g., florigen) that trigger flowering; night interruptions can prevent this response.
- Practical horticulture: indoor cannabis growers shift light cycles (e.g., from 18 hours light/6 hours dark to 12/12) to induce flowering because the longer nightly dark period mimics autumn.

2. Step-by-step reasoning
- Determine whether cannabis flowers when days are long or short. Observationally, cannabis in temperate regions begins to flower as daylight shortens in late summer/early autumn.
- Short-day definition: flowering induced when day length falls below a species-specific threshold (equivalently, night length exceeds a threshold).
- Therefore, cannabis responds to increasing night length (long nights) by initiating flowering.

3. Intermediate steps and illustrative "calculation"
- Vegetative indoor schedule: 18 hours light / 6 hours dark → nights are short (6 h) → no flowering.
- Flowering induced schedule: 12 hours light / 12 hours dark → nights are longer (12 h) → meets the long-night requirement → flowering begins.
- If a night is interrupted by light, the effective night length is shortened and flowering can be delayed or prevented.

4. Why the correct answer is correct
- Empirical and physiological evidence shows cannabis requires long, uninterrupted dark periods to trigger floral development. This is the defining behavior of a short-day (long-night) plant.

5. Why other options are incorrect
- "Long (short night)" is the opposite of cannabis biology: long-day plants flower with short nights, which cannabis does not. The two "No answer text provided." choices are non-answers and thus incorrect.

6. Conclusion
- The correct choice is "short (long night)," which matches the provided answer.

Cannabis is typically a _____ day flowering plant.Single choice

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