The Sirius Limbo Training Technique

Sirius Limbo Training Technique

Cannabis cultivation is many things to many people. A hobby, a passion, a career, a business, a lifestyle – and for some, a necessity. And while the range of reasoning behind why people decide to grow their own weed is multi-layered (as are the cultivation techniques and styles on offer), one of the very first disciplines that most new growers are exposed to is… plant training.

Whatever cannabis cultivation is to you, one thing remains constant: the desire of all upstanding weed producers for a better yield size with higher-quality buds. And one of the most straightforward, easiest ways to give your crop the very best chance of increasing the final yield weight while at the same time boosting trichome output is to impart some controlled stress onto the plants.

This can be achieved in a huge number of ways. If you are looking for a broader plant training guide and the mistakes that need to be understood and avoided, check out our full blog post right here 

The training method we are going to focus our attention on this afternoon (or whatever time it is there) is the Sirius Limbo Training Technique. This is a combination of three of the most commonly used stress training methods all rolled into one, and the results truly do speak for themselves. All three techniques are easy to learn and implement, and by combining them into one training technique you are all but guaranteeing a significant boost to your harvest in both weight and potency.

But, before we dive headfirst into the Sirius Limbo Training Technique, let’s have a quick run-through of how stress training works in general, and why every ganga grower should be looking into implementing a stress training routine – no matter your level of expertise, or the conditions you are growing the crop in.

Cannabis Stress Training 101

Cannabis stress training involves placing controlled physical (and sometimes environmental) stresses on the plant in order to control its growth patterns. The idea behind it is simple: by forcing the plant to focus its energy and resources on a particular area of the plant structure, or by manipulating the shape of the plant itself, you can reach the desired yield and potency outcome of a particular cultivar.

Cannabis plant backlit
A cannabis plant pre-limbo.

Cannabis stress training is split into two main categories – High-Stress Training (HST), and Low-Stress Training (LST).

High-Stress Training Techniques

As the name suggests, HST techniques involve subjecting the plants to high levels of stress, strain, manipulation, or even deliberate damage. It may seem a little counter-intuitive, but by inflicting certain controlled levels of stress, we can improve the robustness of the structure of the plant, which can lead to more budding sites with increased flower density and size.

HST methods include –

  • Topping
  • Fimming
  • Super cropping
  • Mainlining
  • Lollipopping

HST techniques do come with some risks though and are not suitable for all strain types. Autoflowering plants come with a range of benefits (such as faster flowering times and overall growth patterns). Still, unless you have a high level of understanding and experience with a particular autoflowering strain, we do not usually recommend using HST techniques. They just don’t have the vegetative growth time to bounce back from the heavy stress, and the stunt in growth that is a common result of HST.

Low-Stress Training Techniques

Unlike the heavy manipulation of HST methods, LST techniques involve a more gentle guiding and pruning of the plants. This is achieved with certain tools such as trellis, netting, and even a simple length of twine.

By slowly and carefully directing the growth pattern, we can break the Apical dominant (think Christmas tree) shape, and open the canopy right up. This allows for a more even spread of the growth hormones and nutrients to all the budding sites, and also massively boosts the light penetration and airflow throughout the canopy.

LST methods include –

LST techniques can be used with all strain types and can be used hand-in-hand with HST techniques.

The Sirius Limbo Training Technique Explained

Ok, so now that’s outta the way, we can get onto the matter at hand – the Sirius Limbo training technique. As we mentioned above, this is a combination of three of the most commonly employed training methods all rolled into one package –

  • Topping – This is where the ‘crown’ of the plant is carefully and methodically removed. This effectively splits the main stem into two shoots, which results in the plant branching out, promoting the growth of two main colas (budding sites) instead of one. You can top a single plant multiple times, doubling the colas with every cut.
  • Tieing-down – This is the process of manipulating the growth pattern through the use of twine or soft gardening ties. Instead of letting the plant develop in the normal top-down dominance, you gradually tie the main stem and the branches down to create a horizontal canopy.
  • Super-cropping – This technique involves carefully bending and almost breaking the branches of the plant in order to induce a more even spread of growth hormones throughout the canopy. This is achieved by gently pinching well-developed, woody branches until the internal structure is damaged, but without breaking the outer branch shell or skin.

Okay, but why the Sirius Limbo name? What does it all really mean?

The limbo part should be pretty obvious, the Sirius part maybe not so much.

We all know what the limbo game is, yeah?

If not, it’s that fan favorite where you have to bend backward at the hips and knees to shimmy under a pole.

Yeah, well that’s what we are essentially trying to achieve with our plants. There’s no actual pole involved in our game of cultivation limbo, but if you use that imagination of yours and pretend there is a physical pole hovering over the canopy, you will start to get the idea.

But why?

It’s simple really. We talked about spreading and opening up the canopy for more effective light penetration and airflow (as well as a more even distribution of the growth hormones and nutrients), but there is another factor that needs to be considered – for indoor growers, anyway.

The distance from the light to the canopy is a pretty important factor in a successful indoor grow. This distance is dependent on the light fixture /growing-basics/comparing-cannabis-grow-lights/ you are using, but in this brave new world of cannabis legalization and the improvements in technology that come with it, there is really no need to use anything other than an LED panel. While these do allow the light to be a fair bit closer to the canopy than, say, a traditional HID setup.

We are not going to go into the specifics of light-to-canopy distance right here, right now, as there is no one golden rule here. The light will need to be a little further away from immature seedlings and plants in early vegetative growth than further down the line, but the actual perfect distance changes from light to light, so you will need to do a little research of your own to work that out.

But, the Sirius Limbo technique aims to keep the canopy at one uniform height to ensure the budding sites all sit in the perfect ‘goldilocks’ region.

Oh, and the ‘Sirius’ part of the name literally comes from the fact that this method was popularised by a grower going by the moniker “Sirius”. Actually, he credits a friend, ‘Nebular’, with the creation of the method – but it stuck with his name, either way.

How To ‘Limbo?’

First things first. Topping.

Topping Cannabis

You will want to wait until the plant has developed four to seven nodes before you start topping (a node is the ‘joint’ in the main stem where the branches will grow from). By carefully cutting the crown above the fourth to seventh node (we usually top after the fifth node has developed), you force the plant into redirecting its efforts into the two branches that have just started to develop underneath the cut. These become the main stems, doubling the number of top colas.

You can top the plant as many times as you like, but keep in mind that every time you top the plant there will be a period of at least slightly stunted growth which will last anywhere from around 5 to 14 days. The cleaner the cut, the better chance of the plant bouncing back quickly. You will also want to wait until the two branches have reached around the same height as the original crown before topping again.

Once you are done with the topping (or possibly during the topping cannabis process, depending on how many times you intend to top), it’s time to start tying down the branches while also employing some super-cropping. You want to super-crop sparingly, as this puts the plant under heavy stress – and it has already been through the wringer with the topping. The idea is to tie the branches down so the canopy stays at one, nicely spread out height.

How To “Supercrop” Your Plants Into A Limbo

If any branch gets a little out of line or unruly, it’s time to limbo that sucker. Give the branch a nice, firm pinch until you feel a slight pop. That’s a sign that the internal structure has given way, which will induce the plant to focus a lot of its energy repairing itself, and in the process increase the vigor of the entire branch, be careful though, you really do not want to overdo this. If you do get a little carried away, you can wrap the break up in some tape and pray to ‘the old gods and new’ that you haven’t gone too far.

Simplest Training Technique Step-By-Step – The Exact Method I Use For Every Indoor Photoperiod Plant

  1. Once the fifth node has developed, I top the plant. I usually only top my crop once, as I don’t want to have to go through a super extended vegetative growth period. Each time you top a plant, you have to add around 10 days of vegetative growth time for recovery.
  2. I leave the plants to their own devices for around a week and a half to recover, then I begin the tieing down and super cropping techniques.
  3. I do not usually limbo (super crop) every branch, as this will again add to the vegetative growth timing, just the larger ones that are getting closer to the lights than I like.
  4. While tieing down, I am also spreading the canopy as wide and flat as I can.

Keep in mind, you can use this method with an autoflowering strain, but only one that you have a full understanding of. Thanks to the fact that they are not controlled by light timing but instead by their internal genetic timer, autos only stay in the veg growth stage for around 3 to 4 weeks, which means they just don’t have the time to bounce back from the injury before flowering growth begins, unlike photoperiodic strains.

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Sam North

Sam North is a content writer with a passion for everything cannabis. After working multiple seasons on weed farms absorbing the ins and outs of cannabis cultivation and culture, he decided to transition into a role that would allow him to work from anywhere, anytime. Sam now writes for multiple weed publications. He has extensive experience with a wide range of canna-agriculture styles, from smaller artisanal farms to large-scale commercial operations, and is here to share his knowledge to give you all the best chance of cultivation success. About this Author

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