Calcium Deficiency

Calcium deficiency in cannabis, also known as ‘Cal Mag’ deficiency, is a common nutritional disorder affecting cannabis plants, particularly in hydroponic systems or soilless mediums. It manifests when plants are unable to absorb sufficient calcium from their growing environment, crucial for the development of strong cell walls and overall plant structure.

The signs of a deficiency include stunted plant growth, distorted or irregular new leaves, and curled tips that resemble a claw-like appearance. The affected leaves may also display yellow or brown spots and patches, often occurring on upper leaves first as calcium is not a mobile nutrient within the plant.

Identifying and Addressing Calcium Deficiency

Identifying and addressing calcium deficiency early is essential for cannabis health and yields. Growers should maintain proper pH levels in the growing medium, as an imbalanced pH can restrict calcium uptake.

Additionally, ensure that the nutrient solution contains adequate calcium, which may require a calcium supplement, such as a cal-mag product, especially in water with a low mineral content. In organic soil grows, amending the soil with lime, gypsum, or dolomite can help to prevent calcium deficiency.

Is Boron Deficiency Linked to Calcium Deficiency?

Boron deficiency symptoms and treatment can mimic those of calcium deficiency, but the two are not directly linked. Boron is essential for calcium absorption, so a boron deficiency can indirectly affect calcium levels. However, addressing boron deficiency alone may not fully correct calcium deficiency.

The Consequences of Untreated Calcium Deficiency

The consequences of untreated calcium deficiency in cannabis can lead to significantly reduced plant vigor and a poor quality harvest. Weak stems and branches are less capable of supporting heavy flower weights, resulting in reduced yields.

Moreover, the plant’s ability to fight pests and diseases is compromised, making it more susceptible to issues like root rot and powdery mildew. Consistent monitoring and timely interventions can prevent calcium deficiency from undermining the health and productivity of cannabis plants.