Orchid Photosynthesis: Day vs. Night, Leaves vs. Roots

Nwe Lay asked whether orchid photosynthesis occurs day or night, and whether roots photosynthesize. The expert clarified: photosynthesis in leaves requires light and CO₂. Orchid roots also contain chlorophyll and can photosynthesize when exposed to light. In darkness, photosynthetic compounds are synthesized into proteins, releasing oxygen.

Watering and fertilizing timing relates little to photosynthesis. The expert recommends watering early in the day so plant tissues dry before nightfall, preventing bacterial and fungal establishment. The potting mix and root velamen retain moisture and nutrients regardless of watering time.