When walking into the grow room first thing in the morning, you can always tell if a cannabis plant is happy. A flourishing cultivar will have branches spread wide, leaves tilted toward the light source, welcoming the new day. Other times, a particular plant in the room might look limp and weak as yellowing leaves begin emerging on lower branches.
Many variables could be causing the marijuana plant to look so sad. Under or over-watering could be a possibility, especially with down-turned leaves. Droopy leaves also reveal stress-induced from excessive temperature, humidity, or pH imbalances.
Discolouration of leaves is also indicative of improper watering techniques as lower leaves begin turning a light yellow. Often, nutrient deficiencies or build-up due to chemical overload are the culprits for leaf colour changes. growers must then determine what nutrient imbalances are affecting the plant.
A quick way to help the struggling cannabis plant overcome the sickly state is to apply a foliar spray directed towards the plant’s ailment to boost recovery. Spritzing the plant with some much-needed nutrient support may do the trick, depending on severity.
Even when they are not showing signs of distress, foliar feeding marijuana plants is a beneficial method of applying nutrients for quick up-take. As the fine mist showers over the plant, elements absorb rapidly through stomata pore openings on leaf undersides.
Cannabis plants generally flourish with foliar applications. Today we’ll take a closer look at how to foliar feed marijuana plants.
How Marijuana Plants Uptake Nutrients
Feeding cannabis plants the essential nutrients required for prime plant growth is mainly done through root drench applications. A well-rounded formula consisting of the big three – Nitrogen, Phosphorus, and Potassium (NPK), in addition to secondary and micronutrients, is sufficient for plant development.
Foliar spray nutrient doses, on the other hand, enter the leaves on a cannabis plant through tiny openings called stomata. These pore-shaped vessels open and close in response to light. As the morning dawns, stomata open wide and subsequently close during dark periods.
Stomata’s Role in Cannabis Plant Growth
Small guard cells are responsible for opening and closing stomata, expanding and contracting depending on different factors. Stomata are triggered to close by atmospheric conditions such as Vapor Pressure Deficit (VPD), excessive temperature, and humidity levels. Additionally, stress from pathogens, lack of water, and nutrient deficiencies signal stomata to close in response.
These tiny openings have several duties in their contribution to plant growth. First, stomata are responsible for the intake of the gaseous exchange of carbon dioxide during photosynthesis. During light hours, cannabis plants are highly active in synthesizing energy exchange. Stomata open the door for this essential function.
Stomata also play a vital role in regulating water movement through transpiration. The absorption of water is controlled through the tiny pores, closing if necessary to protect the plant from extreme conditions. If stomata remain closed for long periods, the marijuana plant cannot function properly, and the result is often not favourable.