Definition - What does Foliar Feeding mean?
In cannabis cultivation, foliar feeding involves applying nutrients directly to a plant’s foliage, most often with a sprayer or mister. The nutrients are readily absorbed into the plant’s system via its stomata located on its leaves, which are microscopic openings. The plant's stomata are situated in the middle of two guard cells on the leaf skin's epidermal layer.
During foliar feeding, the stomata of the plant benefit not only from the influx of nutrients but also from the mist, which is added humidity that helps keep the stomata open and unclogged. Foliar feeds are rapidly absorbed by the plant, so they quickly provide a nutrient boost to the plant.
Hydrolife explains Foliar Feeding
Foliar feeding of a marijuana plant encourages it to create large buds and yield an ample harvest. Although foliar feeding is highly beneficial, it cannot replace regular nutrient feedings via the plant’s root system.
Cannabis plants benefit from foliar feeding during the vegetative stage. The nutrients should be misted on the plant during the morning when the nutrients will be the most readily absorbed by the plant’s system. Spraying first thing in the morning also prevents fungal infections. Both the tops and undersides of the marijuana plant’s foliage should be misted with the nutrients.
Foliar feeding, also known as foliar spraying, or foliar application of nutrients, is also commonly used to spot treat nutrient deficiencies in plants. However, its effectiveness is debated among growers. Some say it doesn't work, while others swear by the practice.