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This is a discussion on Foliar feeding within the Semi Hydro / Lights / Greenhouses / Accessories forums, part of the Orchid Culture category; Most orchids cultivated by folks are epiphytic and are most certainly foliar feeders, as are ...
Most orchids cultivated by folks are epiphytic and are most certainly foliar feeders, as are most other plants, as well. Many studies confirm this. Liquid seaweed, 'spritzed' onto foliage proves to be 8-20x a more effective delivery system than being applied as a drench.
I've also read that orchids are not able to control the opening and closing of their stomata, but I don't know if this is valid.
Actually that is very wrong, orchids are specialized at opening and closing their stomata. They are CAM plants (Crassulacean Acid Metabolism plants). They open their stomata only at night when the temperatures are cooler and there is less loss of valuable water through transpiration. During the day the the stomata are held tightly closed to avoid the water loss. That is of least concern while foliar feeding because the nutrients are not taken through the stomata alone but through special transporter channels across the plant cell membranes.