High-Stress Training (HST) is a powerful technique used by cannabis growers to maximize yields, improve plant structure, and enhance potency. By intentionally stressing weed plants, growers can encourage bushier growth, better light exposure, and higher flower production. Whether you’re an experienced cultivator or a beginner, understanding and applying high stress training techniques can take your cannabis cultivation to the next level.
In this article, we’ll dive deep into high stress training cannabis methods, including topping, IST (Intensive Stress Training), and how HST compares to low stress training (LST). Plus, we’ll provide a step-by-step high stress training guide to help you master this cultivation technique.
What is High Stress Training (HST)?

High Stress Training (HST) covers a range of advanced techniques that are used to stress cannabis plants, encouraging stronger growth and higher yields. While Low Stress Training (LST) is a technique that involves gently bending and tying back plants without causing physical harm, HST does involve a more extreme measure, mutilating them slightly by cutting or bending their stems.
These techniques compel the plant to allocate energy more efficiently, leading to a more robust structure and stimulation of additional points for flowering. It is important to note that this method does carry some risk, but when done correctly, high stress training weed plants can greatly increase yield.
Benefits of High Stress Training Cannabis
- Increased Yield – Promotes the formation of several colas instead of one main stem.
- Good Light Penetration – Allows for light exposure throughout the plant.
- Increased Potency – Some growers claim an increase in cannabinoid production.
- Stronger Plants – Assists in building resistance to pests and environmental stressors.
- Better Control – Gives indoor growers the ability to control the shape and structure of the canopy.
High Stress Training Techniques
Topping is a popular high stress training method. The main stem’s top growth is removed to allow the plant to have many colas instead of just one single bud.
1. Topping and IST Cannabis
Topping is one of the most widely used high stress training techniques. It involves cutting off the main stem’s top growth to encourage the plant to produce multiple colas instead of a single dominant bud.
- Step-by-Step Topping:
- Wait until your cannabis plant has at least 4-6 nodes.
- Use sterilized scissors or a razor blade.
- Cut the main stem just above the third or fourth node.
- Allow a few days for recovery.
- New branches will emerge from below the cut, forming a more even canopy.
A variation of the topping technique is to utilize intensive stress training (IST), that uses a combination of topping and other stress methods such as defoliation or super cropping for maximum manipulation of plants.
2. Topping and Low Stress Training (LST)

LST is typically paired with Topping for deeper control of plant shape. LST method Bending branches or tying them down.
- How to Combine Topping and LST:
- The best plant topping time is early on (3-4 weeks).
- As new branches grow, gently bend them outward and tie them in place using soft plant ties.
- Adjust ties to distribute branches evenly across the canopy.
- Keep training until the plant takes your preferred shape.
3. Super Cropping (HST Cannabis)

Super cropping is a more advanced high stress training cannabis technique in which growers pinch and crush a branch only enough to allow it to begin growing in another direction.
- How to Super Crop:
- Choose a strong, flexible branch.
- Gently squeeze the stem between your fingers until it softens.
- Bend the branch in the desired direction.
- Use tape or plant ties if necessary for support.
- The plant will repair itself, developing stronger stems and more bud sites.
4. Mainlining
This trimming technique consists of several rounds of topping plants to develop a uniform structure with balanced colas.
- Steps to Mainline Cannabis Plants:
- Topping your plant above the third node.
- Do a little pruning to remove lower branches, leaving you with only two main stems.
- Keep topping and training any new shoot to stay balanced.
- Use ties or netting to open the plant into a flat, even canopy.
Step by Step High Stress Training Guide
When to Start HST
- Begin high-stress training when plants are 3-4 weeks old with strong growth.
- Avoid HST during the flowering stage, as it can cause stress-related issues.
How to Apply HST Techniques
- Choose Your Method: Decide between topping, IST, super cropping, or a combination.
- Use Clean Tools: Always sterilize scissors or blades before cutting.
- Monitor Plant Recovery: Watch for signs of stress like drooping leaves, but allow time for recovery.
- Support Growth: Use ties, stakes, or trellis netting to maintain structure.
- Adjust as Needed: Continue training until plants reach optimal size and shape.
Conclusion
With advanced high stress training, your plants are well on their way to becoming extremely productive cannabis plants, at length. Topping, IST, super cropping, and mainlining are amongst the techniques that could be used to improve the health of the plant, as well as increasing production of buds while producing plants that are healthier, more robust, and ultimately, more capable in tougher environments. This step-by-step high stress training guide will teach you everything you need to know to make a successful transition to high stress training cannabis cultivation, though mindfulness and skill will be necessary to execute the process successfully.
FAQs About High-Stress Training
1. Is high-stress training safe for all cannabis strains?
HST works best with strong, healthy plants. Some strains, especially Indicas, may be more sensitive than Sativas, so monitoring recovery is crucial.
2. What’s the difference between high-stress training and low-stress training?
HST involves cutting, bending, or breaking stems to force new growth, while LST uses gentle bending without physical damage.
3. When should I stop high-stress training?
HST should be completed before the flowering stage to prevent undue stress and ensure plants have time to recover.
4. How long does it take for a plant to recover from HST?
Recovery times vary but usually take 3-7 days. Providing proper nutrients and a stable environment helps speed up healing.
5. Can I use multiple HST techniques on one plant?
Yes! Many growers combine topping, IST, and super cropping for maximum control and yield.