August 05, 2020
If you want to get a crop of very dense, resin-filled buds, the type of pruning you do plays a very important role. The two best-known types of medicinal plants pruning are apical pruning, known as TOPPING, and fim pruning, known as FIMMING.
What Is Topping?
Topping is a technique used by medicinal plants growers during the vegetative cycle, during which time you cut off the top part of a plant to stop vertical growth in order to instead promote lateral growth toward the bottom branches of a plant. It may sound absurd to cut off and dispose of part of your medicinal plant, yet this is an essential step to ensure your plants are healthy and provide a quality yield. Think of it as a short-term loss for a long-term gain – and it truly is a gain. After topping, growth hormones are evenly distributed toward the lower end of the plant, allowing these smaller side branches to grow out and form large, dense buds.
Topping is best applied with a single, clean cut to the tip of the main stem with sterile scissors. Remove 100% of the tip from the main stem and one cola will become two. Best of all, the process can be repeated again and again to double-down on the number of top colas.
All seasoned medicinal plants growers will agree that topping is a technique for the vegetative growth phase. Exactly the right moment is a matter of debate. Most growers these days will top early, typically when the plant has just 3-5 nodes. On the other hand, old-school growers are usually a little more patient, waiting about 30 days or until plants are at least 30cm in height before topping.
As topping is a HST method, plants will need some time to recover. Allow 1-2 weeks before applying further pruning and training techniques.
Fimming is a technique used by medicinal plants growers to dramatically increase the yield of their plant while also making the plant more manageable. It’s usually done by growers with limited space. As no two FIMs are the same, it’s important not to expect the same result every single time. Commonly referred to as ‘FIM’, the act of cutting a young medicinal plants in a certain way is historically known as an acronym for “F**k! I missed”. The key difference between topping and FIMming is the location at which the medicinal plants is cut. With FIMming, you remove any new growth while avoiding any cuts between the nodes, whereas with topping, you cut off the top of the plant altogether.
Just like with topping, the FIM technique is best applied during the vegetative growth stage. But unlike topping, this method favours a less precise approach. FIM does stand for “Fuck I Missed” after all. Pinching off 75% of the tip from the main stem between fingers is preferred to a neat scissor-cut to the whole tip.
It ain’t pretty, but it works. At least 4 new shoots will emerge in a week or two. Sometimes as many as 8. Moreover, secondary shoots will catch up growing in the meantime. Apart from a few disfigured fan leaves, the FIM method is not all that different from topping. 1-2 weeks recovery time post-FIM is standard.
LIMITATIONS OF TOPPING AND FIMMING
Topping and fimming will prolong the amount of time medicinal plants will need to spend in the 18/6 vegetative growth stage. Expect a 4-6 week vegetative growth phase if you plan on applying these techniques.
Another oft-overlooked and obvious problem with encouraging the formation of multiple fat colas is that medicinal plants tend to become really top heavy. In the absence of a ScrOG, plants may require staking with bamboo for support.
The Best Pruning Tools for medicinal plants
You don’t need much in terms of equipment for topping and fimming. For fimming, you simply need your fingertips but for topping it is a good idea to get a pair of good quality pruning tools so that you can be assured of a quick, clean snip to your precious plants. Here we review some of the best.