A boron deficiency in cannabis is relatively uncommon, except when the plant is not receiving sufficient water or is exposed to extremely dry conditions. Typically, it coincides with other nutrient or pH issues, manifesting as leaf problems. The initial signs of a boron deficiency include unusual or thick growth tips and the development of brown or yellow spots on new leaves. New growth in affected marijuana plants may exhibit dark patches, indicating the onset of a boron deficiency. Additionally, upper cannabis leaves may exhibit abnormal growth, slow growth, twisted growth, or even die off. Wrinkled or curled leaves may also be observed. Roots may display unhealthy or stunted growth, and stems can become rough or hollow. It's worth noting that a boron deficiency may resemble a calcium deficiency since boron is necessary for the plant to properly utilize calcium. New growth is primarily affected, displaying a burnt or scorched appearance. Furthermore, a boron deficiency often coincides with apparent deficiencies in potassium or nitrogen, as these nutrients are essential for boron utilization by the plant.