A Beginner’s Guide to Training Cannabis Plants

What is plant training?

In the same way we can train our bodies in the gym to become more athletic or stronger, the same applies to Cannabis plants. As the plants grow from seedlings into a vegetative small bush, certain techniques can be applied with recovery time granted, that can shape the final structure of a strain.

Not all Cannabis strains react the same to training techniques as others, so learning which plants prefer which techniques can be a learning curve. Short and stocky indica dominant cultivars will work better than tall, lanky and fast-growing sativa dominant plants with some training techniques, and vice versa.

When should I start training my plants?

The ideal window to perform the various different techniques is during the vegetative stage, meaning when the lights are on for 18/6. It is during this time your seedlings or clones will focus on producing a large mass of roots, branches, stems and waxy, lush foliage. 

Once your plants have reached the 3rd internode, you may begin to apply techniques such as pinching out. However, you will want your plants to become tall enough and with enough branching, that you have a canopy to start with that can be easily tied down, super cropped, fimmed, pinched out or pruned. Usually when plants reach a height of 30 cm and above, manipulating the final shape is much easier and will allow plants to respond quickest. 

How do I train my plants?

The beauty of training Cannabis plants is that depending on your end goal, you can customize which techniques are used, when they are performed and depending on your vegetative time can grow enormous plants prior to flowering under 12/12. All the plant training techniques covered below are very easy to perform, can be done by hand, or using a sharp and sterile pair of scissors or scalpel.

Technique : Pinching Out

Cannabis plants are an apical dominant species, meaning they will always produce a main crown shoot that will become the tallest point of the plant. When the growth hormone named auxin, which is responsible for vertical growth, is disrupted, the shape of the plants will become bushy and squat. Where there was once a single crown shoot, will now reveal the 2 smaller axillary shoots that grow together as a pair, causing the number of crown shoots to double each time. 

The Benefit

• Pinching out can help reduce the final height and stretch when flowered.
• Sativa dominant strains can be controlled easier and encouraged to grow squat.
• Cannabis plants can be constantly topped, producing numerous growth sites. 
• Indica strains will remain low when pinched out and become very stocky.

Technique : Super Cropping

A high stress technique that involves breaking the stem to purposely break the inner cell walls. This technique is hand performed using a twisting and snapping motion, and can sometimes occur naturally when a branch snaps over from heavy winds outdoors. It is best to perform super cropping on Cannabis plants that are older than 5 weeks and are able to take the trauma of the break and recover with a much stronger outer part that is pumped with growth repair hormone. 

The Benefit

• Super cropping causes plants to grow with a more compact and bushy structure.
• The original break becomes very tough and can support more weight.
• Snapping stems and allowing them to be set using string can also reduce height.
• Growth hormone is distributed to the rest of the plant, causing an increase in size.

Technique : LST

Low stress technique as the name suggests is a gentle way to trick Cannabis plants to fight over apical dominance and to become the crown shoot. As Cannabis plants naturally grow one tall central cola, by tying down the tallest shoots, the plants will encourage the remaining lower parts of the canopy to take their place and become the dominant crown shoots. After 3 days, the tied down parts will have grown back vertically and should align with the other growth sites, causing an even and square shaped canopy. 

The Benefit

• A very gentle and easy to perform method which can increase yields significantly.
• LST can be continuously performed all the way until the start of the flowering period.
• Tying down can also help reduce the final height, especially during the stretching phase.
• There are many ways to tie plants down using string, nets, weights and wire.

Technique : Fimming

A version of topping, however, 30% of the top shoot is purposely left on. Rather than totally remove the top shoot and expose the two auxiliary shoots, by leaving part of the top part behind, the plants will focus their growth energy on the remaining side branches and new shoots. It takes around 5–7 days for the plant's growth to resume back to normal, causing a busy and squat profile. To correctly perform fimming, a clean and sterile pair of scissors should be used. 

The Benefit

• Fimming allows the lower parts of the canopy to become more established.
• Yields can be increased, with some strains reacting better than others. 
• Only a pair of scissors is required to make a clean cut, removing 70% growth.
• Fimmed plants will produce more lower shoots, ideal for cloning. 

Technique : Pruning

Pruning is an old school method that basically involves removing the foliage of a set part of the plants. The goal is to allow the plant’s energy to be diverted into the remaining canopy, producing only large sized buds, and disregarding any undeveloped popcorn sized lower buds. Pruning can be done slowly over time, or it can often be a heavy strip that can remove up to 80% of the foliage in one go. 

The Benefit

• Pruning plants will improve the air flow around the pots and grow room.
• Yields will be increased and there is no concern over small sized buds.
• An excellent way to take healthy viable clones before flowering under 12/12.
• The risk of powdery mildew and mold is reduced when plants have been pruned. 

Conclusion

Training Cannabis plants can be a learning curve that takes time and patience. Not all strains will react the same way, and as a beginner, working with indica dominant varieties can be the best starting point. It is essential that when applying the various techniques covered above, that you allow plenty of recovery time and give the plants time to fully heal. Good luck finding out which methods work best for you and taking your yields to the next level!