Hidden Light Signals: How the Red:Far‑Red Ratio Controls Plant Growth

Dr. Russell Sharp explores the critical red-to-far-red (R:FR) light ratio, how phytochrome senses these wavelengths, and how that signal shapes germination, stem elongation, flowering, and canopy architecture. He reviews practical grower strategies—LED spectrum tuning, end-of-day far-red pulses, crop-specific recommendations (basil, lettuce, tomatoes, ornamentals, legal cannabis), and recent insights into far-red’s photosynthetic role. https://eutrema.co.uk/shop/soil-conditioners/organic-ph-down-2/