Training I: Bend, Don't Break

What You Need to Know

A plant left to its own devices grows like a Christmas tree: one tall main cola hogging the light at the top, a ring of runts underneath sitting in its shadow. All your dialled-in light from Lesson 2.1 lands on the one top and gets swallowed before it reaches the rest. Training fixes that — you reshape the plant so the light reaches more bud sites, and you do it by working with how she’s built, not against it.

The reason training works at all comes down to one piece of plant behaviour: apical dominance. The plant sends its growth hormones to its highest tip, which is why the top grows fastest and the lower branches stay suppressed. Move that highest tip — bend it below the others, or cut it off — and the plant redistributes. The suppressed lower branches think they’re in charge now and surge upward. Instead of one dominant cola, you get a flat, even canopy where every site gets a fair share of light. That’s the entire principle behind the two techniques in this lesson.

Low-Stress Training (LST) — Physiotherapy, Not Surgery

LST is the gentle one, and the right place to start. You’re not cutting anything — you bend stems down and tie them in place so the canopy flattens out. Bend the tallest stem over until it’s roughly horizontal and tie it to the pot rim. Within a day or two the tip curves back up toward the light, while the lower branches, no longer suppressed, rise to meet it. Keep tying the tall bits down as they climb. From above you’re aiming for a flat green table — branches radiating out like a star, every bud site at the same height.

Start early, while the stems are young and flexible. Once she has five or six nodes, that’s your window. Use soft ties — plant wire, pipe cleaners, fabric garden ties. Nothing sharp; I once watched a lad use chicken wire as a frame and it cut into the stems as the plant grew, slow-motion garrotting.

Topping — Surgery, With a Recovery Window

Topping is cutting the main growth tip off at the fourth or fifth node. It removes the dominant top entirely, and the plant responds by sending up two new leaders in its place — turning one main cola into two. Top, let the two leaders grow a few inches, then bend them outward with LST, and you’ve got the wide flat canopy that fills a small tent. For photoperiod plants, topping plus LST is the standard small-tent playbook.

But topping is a wound, and a wound needs time to heal. That’s the catch that decides everything below.

Seb’s Corner — why the auto rule is absolute. A photoperiod plant flowers when you change the light schedule, so its veg length is flexible — top it, and you simply give it an extra week of veg to recover and bush out before you flip. An autoflower flowers on age, not light, usually around week three or four from seed, regardless of what you do. There is no extending the clock. Top an auto on day fourteen and she goes into flower around day twenty-one still trying to heal the cut — she spends a quarter of her entire life recovering from surgery instead of building structure. The result is a stunted plant with two sad colas and a fraction of the yield she was capable of. The technique wasn’t wrong and the genetics weren’t wrong; the combination was. So the rule for autoflowers is hard: LST only, gentle, started early, hands off once the stretch begins. Save topping and any high-stress technique for photoperiods, where the recovery window actually exists.

A Word on Supercropping (Not Yet)

You’ll hear about supercropping — pinching and folding a woody stem to crush the inside without breaking the skin, so it heals into a stronger knuckle and stays shorter. It’s a real technique with real benefits, but it’s a high-stress one: you’re deliberately injuring the plant. It belongs to your second grow and beyond, on healthy photoperiods in late veg to early flower, never on an auto. The full method lives in the supercropping appendix. For this level, the lesson is the gentler pair: bend with LST, top only if you’ve the recovery window for it.

When Not To Touch Her

Training is for healthy, vigorous plants. Leave her alone if she’s stressed, underfed, recovering from something, or deep into flower. A training technique on a plant already running on fumes doesn’t redirect energy — it removes it. And never high-stress an autoflower. The kindest training is sometimes none.

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How To Apply This

1. Read how she grows first (Level 1 / Lesson 2.1 territory). A stretchy plant in a short tent needs training started early and low; a compact one needs less.
2. Start LST around five or six nodes, while stems are flexible. Bend the tallest stem toward horizontal and tie it soft to the pot rim.
3. Keep the canopy flat. As lower branches rise, tie them down too. Aim for that even green table seen from above.
4. If you top, do it on a photoperiod only, at the fourth or fifth node, then LST the two new leaders outward once they’ve grown a few inches.
5. For autoflowers, LST only — gentle, early, and hands off once the stretch starts.
6. Train only a healthy plant, and stop training before deep flower. If she’s stressed or recovering, leave her be.

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Watch Out For

This is where the keen grower does the most accidental harm, so go slow.

The topped auto. The single most common training disaster — applying a photoperiod technique to an autoflower timeline. She has no recovery window, so the cut costs her a quarter of her life. If it’s an auto, LST and nothing sharper.

Bending stems that have gone woody. LST is for young, flexible growth. Wait too long and the stem snaps when you bend it. If it does snap but isn’t fully severed, wrap it snug with micropore tape and leave it — the plant heals it into a knuckle, often stronger than before. A fully severed branch is gone, but the rest takes over its light. A tax, not a funeral.

Sharp ties. Chicken wire, thin string, anything that bites — it cuts into the stem as the plant thickens. Soft ties only, gentle curves.

Training a struggling plant. If she’s underfed, stressed, or recovering, training takes energy she doesn’t have. Get her healthy first. The plant wants to live — your job is to stop helping so hard at exactly the wrong moment.

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Quiz

1. What is apical dominance, and how do training techniques use it?
2. How does low-stress training (LST) differ from topping in what it physically does to the plant?
3. Why must you never top or high-stress an autoflower?
4. A young stem you’re bending snaps but stays partly connected. What do you do?
5. Name two situations in which you should leave a plant untrained.

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Sources

Chapter 3, The Grower’s Guide (book draft) — apical dominance, LST method, topping plus LST for photoperiods, the topped-auto failure, and the photoperiod-vs-auto recovery difference. Supercropping appendix — flagged as a later, high-stress technique and excluded from this level’s hands-on scope. General horticultural knowledge on apical dominance and wound healing; no paywalled sources used.

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Answer Key

1. Apical dominance is the plant directing its growth hormones to its highest tip, which suppresses lower branches. Training relocates or removes that highest tip (by bending or cutting), so the plant redistributes growth to the lower branches and produces an even canopy.
2. LST bends stems down and ties them in place without cutting anything; topping cuts the main growth tip off entirely, prompting two new leaders to replace it.
3. An autoflower flowers on age, not light, so there’s no way to extend veg for recovery — topping or high-stress work means she goes into flower still healing, costing a large share of her short life and her yield.
4. Wrap the partial break snug (not tight) with micropore tape and leave it alone; the plant heals it into a strong knuckle.
5. Any two of: she’s stressed, underfed, recovering from something, deep into flower, or she’s an autoflower (for high-stress techniques).

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Next lesson: Deficiency or Lockout? Reading the Leaves — the capstone diagnostic skill for this level, where everything — environment, pH, feeding — gets read off the plant in the right order.