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In hemp cultivation, “topping” refers to the process of selectively cutting off the upper portion of the plant during its vegetative (growth) phase. This practice holds a central and essential role in plant training, as it encourages horizontal growth and optimizes light utilization, resulting in increased yields.

When a plant is topped, the two auxiliary buds located just below the cut site develop into full-fledged branches, often taking on a Y-shaped structure. These secondary branches can also be subjected to topping at a later stage, further enhancing the potential for higher yields. The underlying principle at play here is known as “apical dominance.” Various plants exhibit different forms of apical dominance, influencing their patterns of both vertical and horizontal growth.

Topping is considered a “high-stress” training technique since it involves the removal of the upper growth tip from the main stem or a branch. Some growers may initially worry that this practice could impede the plant’s growth, particularly in its early stages. However, when executed correctly, topping is a vital method for accelerating canopy development and reducing vegetative periods, ultimately leading to more robust and productive hemp plants.

Reference

• Topping Cannabis Plants | 2023 Guide | American Marijuana
• Topping Cannabis Plants | Why, When and How to Top (growbarato.net)
• Topping Cannabis Plants: Why, When & How – Coco For Cannabis

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