Which plant is associated with photoperiodic control to regulate flowering?

Which plant is associated with photoperiodic control to regulate flowering?

• A. Daffodils
• B. Orchids
• C. Potted mums
• D. Tulips

Answer: (C)

Photoperiodic control of flowering means the timing of bloom is driven by day length. Chrysanthemums are a classic short-day (long-night) plant; they initiate flowering when nights exceed a critical length. In greenhouses, growers manipulate light to create those long nights, forcing the plants to bloom at desired times. That connection to controlling flowering with night length is why potted mums are the plant associated with photoperiodic flowering control. Daffodils and tulips rely more on seasonal cues and chilling, while orchids have their own specific cultural requirements, not primarily tied to day length for flowering.

Photoperiodic control of flowering means the timing of bloom is driven by day length. Chrysanthemums are a classic short-day (long-night) plant; they initiate flowering when nights exceed a critical length. In greenhouses, growers manipulate light to create those long nights, forcing the plants to bloom at desired times. That connection to controlling flowering with night length is why potted mums are the plant associated with photoperiodic flowering control. Daffodils and tulips rely more on seasonal cues and chilling, while orchids have their own specific cultural requirements, not primarily tied to day length for flowering.