Fimming and Topping: Pros and Cons

Fimming and topping are horticultural techniques commonly applied to cannabis plants to control their growth patterns and potentially increase yields. Both methods involve the removal or cutting back of the plant’s main shoot, leading to a change in its growth trajectory. Despite their shared intent, each method has distinct procedures, results, and benefits. This article explores the pros and cons of fimming and topping, aiming to provide a comprehensive understanding of these essential cultivation practices.

Understanding Fimming and Topping

Topping and fimming are high-stress training (HST) methods used to induce the cannabis plant to grow more horizontally rather than vertically.

Topping involves the removal of the plant’s main apical shoot, usually between the third and fifth node. This action creates a ‘Y’ shape and enables the plant to focus its energy on two main shoots instead of one. As a result, it promotes a bushier plant with increased lateral growth.

Fimming (short for “F**k, I Missed”), on the other hand, is less precise. Instead of cutting at the stem like in topping, it involves removing approximately 70-90% of the newest shoot while it’s in its early growth stages. Fimming typically leads to the development of four new growth sites instead of two, thereby creating a fuller and bushier plant.

Benefits of Topping and Fimming

Maximized Light Exposure and Yield: By encouraging horizontal growth, both techniques allow more light to reach a larger number of buds, boosting the plant’s overall yield. Bushier plants typically produce more buds than tall, lanky ones because they have more flowering sites.

Growth Control: Topping and fimming provide an effective way to control the height of a cannabis plant. This is particularly beneficial for indoor growers, who often have limited vertical space. Controlling the plant’s height also simplifies tasks such as lighting and pruning.

Increased Potency: Both techniques can result in plants with increased potency. When energy is directed towards more buds rather than a single cola, the plant’s resources are divided more evenly, potentially increasing the THC content in each bud.

Drawbacks of Topping and Fimming

Recovery Time: Topping and fimming are both high-stress training methods, meaning they can be somewhat traumatic for the plant. After these procedures, plants require a recovery period that can last from a few days to a week, slowing their overall growth rate.

Risk of Infection: Both techniques involve cutting the plant, which exposes it to potential pathogens. While this risk can be mitigated with proper sterilization and a clean growing environment, it’s still a factor that growers must consider.

Risk of Stressing the Plant: If applied excessively or improperly, topping and fimming can cause significant stress to the plant, potentially leading to stunted growth or even plant death. Therefore, these techniques should be performed judiciously and with proper knowledge.

Choosing Between Fimming and Topping

The choice between fimming and topping often depends on the grower’s specific goals and circumstances.

Topping is a more straightforward technique, and its results are somewhat predictable, with two new growth sites typically developing from the cut. It is ideal for growers who desire a neat, symmetrical plant shape, and it’s often the preferred method for beginners.

Fimming, in contrast, usually results in more growth sites but less predictability in terms of the plant’s shape and size. The technique is often preferred by experienced growers who want to maximize their yield and don’t mind the extra care required for managing a more bushy and complex plant.


Both topping and fimming have their unique benefits and drawbacks, largely influenced by the grower’s skill level, growing environment, and desired outcome. These techniques offer an effective way to manipulate the cannabis plant’s natural tendency to grow vertically, resulting in more robust, bushy growth and potentially enhanced yields.

As with any high-stress training method, it’s crucial that growers approach these techniques with care and knowledge. A deep understanding of the plant’s life cycle, combined with proper sanitation practices, can significantly reduce the risks associated with these methods and increase the chances of a successful, bountiful harvest.

Given their potential to improve yield and potency, both topping and fimming are valuable tools in the cannabis grower’s arsenal, warranting further study and practice for those interested in maximizing the benefits of cannabis cultivation.