Foliar Feeding

Foliar feeding refers to the horticultural practice of applying nutrient solutions directly to plant leaves rather than through root absorption in soil or hydroponic media. In cannabis cultivation, this technique involves spraying diluted fertilizers, micronutrients, or other supplements onto leaf surfaces, where they are absorbed through stomata and cuticle layers. Breeders and cultivators sometimes employ foliar feeding to address suspected nutrient deficiencies quickly, support plant vigor during specific growth stages, or supplement hydroponic systems. The practice is classified by application method and timing rather than genetics, though certain cultivars may show variable leaf morphology that affects spray penetration and absorption efficiency. Success depends on pH balance, spray concentration, environmental conditions, and plant maturity stage.

Plant breeders working on cultivars for commercial production environments sometimes select for leaf surface characteristics—such as epicuticular wax profiles and stomatal density—that may improve or complicate foliar nutrient uptake. Understanding how different genetic backgrounds respond to foliar applications informs cultivation protocols and can reveal metabolic or structural traits relevant t