Top at Node 5: Classroom Tested Pruning for Minnesota Growers

Sep 3, 2026 | Education | 0 comments

Top at Node 5: Classroom Tested Pruning for Minnesota Growers

Student making a topping cut above node five

Pruning cannabis correctly means combining early vegetative topping or FIM with low-stress training (LST) and selective defoliation, timed to your plant’s growth stage. Done this way, you get more usable bud sites, better airflow, and stronger light penetration into the canopy. The trick is matching the technique to the stage: heavy cuts belong in veg, gentler shaping carries you into flower, and autoflowers need a lighter touch than photoperiod plants.

TL;DR:

  • Major pruning techniques should be timed during veg, with heavy cuts like topping and FIM done early, and lighter trimming into flowering, especially for autoflowers.
  • Sterile, sharp tools and careful timing are crucial to avoid overpruning, stem damage, or spreading disease, with no more than one-third of foliage removed at once.
  • Combining techniques such as topping, LST, and selective defoliation yields better results than relying on a single method, especially in space-constrained grows.
  • Autoflowers generally benefit from LST and light supercropping, with pruning and topping avoided to prevent stressing the plant’s limited vegetative window.

Table of Contents

What Are the Main Cannabis Pruning Techniques?

Every pruning method falls into one of two camps: high-stress training (HST), which removes plant tissue, and low-stress training (LST), which reshapes the plant without cutting anything away. That distinction matters more than most grow guides let on, because it determines how your plant’s hormones respond.

Cannabis plants exhibit apical dominance: the main stem’s growing tip produces auxin, a hormone that suppresses the growth of lower branches so the plant focuses energy upward. When you remove that tip, auxin redistributes and lateral buds wake up, often producing two or more colas where there used to be one. That is the biological engine behind topping and FIM, and it is why timing those cuts matters so much.

Here is what each core technique does structurally:

  • Topping: cuts the main stem above a node, typically producing two new dominant colas from the two nodes just below the cut.
  • FIM (fim, short for "f* I missed")**: a partial pinch of the growing tip rather than a clean cut, often yielding three to four new shoots, though the result is less symmetrical than topping.
  • LST (low-stress training): bending and tying down branches to flatten the canopy, without removing any tissue.
  • Supercropping: gently crushing the inner stem fibers of a branch so it bends without breaking, redirecting growth without a clean cut.
  • Lollipopping: stripping lower growth that will never receive enough light to form dense buds, so the plant’s energy goes to the top canopy.
  • Defoliation: selective removal of large fan leaves to open airflow and light access to lower bud sites.
  • Mainlining: a structured combination of early topping and LST that splits the plant into a symmetrical number of main colas, often used with a ScrOG (screen of green) setup.

Topping gives you predictable, even colas that mesh well with a ScrOG screen. FIM trades predictability for speed and shoot count. LST and supercropping preserve every leaf’s photosynthetic capacity, which makes them the safer choice when a plant’s vegetative window is short. Lollipopping and defoliation are not really about growth control at all. They are triage: deciding which parts of the plant deserve the light and nutrients you have, and which don’t.

How Do You Prune Cannabis Step by Step?

Each technique has its own rhythm. Follow these in sequence and you will avoid the two most common failures: cutting at the wrong node and cutting too much at once.

Topping and FIM:

  1. Wait until the plant has developed at least five or six full nodes.
  2. For topping, cut cleanly above the node with sterilized shears, just above the leaf set where you want the split to happen.
  3. For FIM, pinch or snip roughly 70 to 80 percent of the new growth tip instead of removing it entirely, leaving a small remainder to regrow into multiple shoots.
  4. Water lightly and hold off on any additional stress for at least 48 hours.

LST:

  1. Start once the plant has three or four sets of true leaves and stems have some flexibility.
  2. Gently bend the main stem or side branches downward and secure them with soft plant ties or garden wire wrapped in cloth, anchoring to the pot rim or a stake.
  3. Re-tension every three to five days as the plant grows toward the light, always retraining new growth outward and flat.

Supercropping:

  1. Pick a branch that is tall enough to be pinched between your fingers, roughly a third of the way down from the tip.
  2. Roll the stem gently between your thumb and forefinger until you feel the inner fibers give slightly, without breaking the outer skin.
  3. A successful pinch leaves the branch limp and bent within an hour, then rigid again within a day or two, healed with a slight knuckle at the bend point.

Lollipopping and selective defoliation:

  1. In late veg or the first one to two weeks of flower, remove small popcorn buds and lower branches that sit below the main canopy line and get little direct light.
  2. Remove large fan leaves that shade bud sites directly beneath them, working from the bottom up.
  3. Never take more in one session than the plant can comfortably regrow. Removing more than about one-third of total foliage at once risks setting back photosynthesis rather than helping it.

Sterilize your blade between every cut, on every plant, without exception.

Pro Tip: Combine techniques instead of picking just one. A common high-yield workflow tops the main stem early, spreads the resulting colas with LST, then trains the new shoots into a flat screen for even light distribution. Growers document this top-then-train-then-screen approach as one of the more reliable paths to a full, even canopy indoors.

When Should You Prune Cannabis for Best Results?

Timing decides whether a cut helps your plant or costs you weeks of recovery. As a general rule, the earlier in veg you do your heaviest cuts, the more time the plant has to recover before flowering starts.

  • First topping or FIM: wait for five to six nodes, typically two to three weeks into veg for most photoperiod strains.
  • Stop major HST: at least two weeks before you plan to flip to a 12/12 light schedule, so the plant fully recovers before it shifts into flower production.
  • Acceptable pruning after flip: light lollipopping and lower-branch removal during the first one to two weeks of flower, before bud sites fully form.
  • LST timing: can continue safely deep into flower on sturdy branches, since it never removes tissue.
  • Autoflowers: skip topping and FIM in most cases. Autoflowers run on an internal clock rather than a light schedule, and most guides recommend against repeated HST because these plants simply don’t have the extra vegetative time to recover. LST and light supercropping are the safer default here.

If you’re growing indoors in Minnesota under a controlled light schedule, this timing window is entirely up to you. Outdoor growers working with natural daylight need to track the calendar more closely, since the flip to flower happens on nature’s schedule, not yours.

What Tools Do You Need for Clean, Safe Cuts?

Your toolkit does not need to be elaborate, but it does need to be clean. A dull or dirty blade is the single fastest way to invite pathogens into an open wound.

  • Sharp micro-tip pruning shears for topping and stem cuts.
  • A small scalpel or precision blade for FIM’s partial pinch.
  • Soft plant ties, cloth-wrapped wire, or velcro strips for LST anchoring.
  • 70%+ isopropyl alcohol wipes for sterilizing between every plant and every cut.

Clean, sharp cuts heal faster and resist infection better than ragged ones made with a dull blade. Most growers do fine leaving fresh cuts open to air rather than applying sealant, since cannabis stems callus over on their own within days. Right after any pruning session, bump your ventilation slightly and avoid spiking humidity, since fresh wounds are more vulnerable to mold in stagnant, damp air.

Pro Tip: Sterilize between plants, not just between sessions. Moving a contaminated blade from a sick plant to a healthy one is one of the most common ways growers accidentally spread disease through a tent.

What Does Recovery Look Like After Pruning?

The first week after a cut sets the tone for everything that follows. Keep conditions gentle rather than pushing growth.

  • Target a moderate vapor pressure deficit (VPD) and dial back light intensity (PPFD) slightly for three to seven days after any HST.
  • Hold off on heavy feeding. A stressed plant with damaged tissue cannot use extra nutrients efficiently, and pushing fertilizer during recovery often does more harm than good.
  • Watch for new growth at the cut site within three to five days for topping and FIM.
  • Expect visible upward reorientation of LST-trained branches within 24 to 48 hours as the plant reaches back toward the light.

A useful guardrail here: removing more than roughly one-third of a plant’s foliage in a single session is considered excessive in most greenhouse guidance, since it starts cutting into the plant’s ability to photosynthesize its way through recovery. If you see wilting that doesn’t resolve within a day, new growth that has stalled for more than a week, or soft, discolored tissue near a cut site, back off on any further intervention and let the environment do the work.

What Are the Most Common Cannabis Pruning Mistakes?

Almost every pruning problem traces back to one of a few repeat offenders.

  • Overpruning: stripping too many leaves at once starves the plant of the photosynthetic area it needs to recover. Fix it by stopping immediately and giving the plant one to two weeks of undisturbed growth before touching it again.
  • Mistiming HST: topping too close to the flip, or topping an autoflower at all, both shortchange the plant’s recovery window. If you’ve already made the cut, extend veg time if you can, or ease off on nutrient strength to reduce added stress.
  • Broken stems from LST: tying too tightly or bending too fast snaps stems instead of flexing them. A light stem wrap or plant tape can often splint a partial break, but a fully snapped main stem usually means letting a side branch take over as the new leader.
  • Not knowing when to stop: the biggest mistake is treating pruning as something to do on a fixed schedule rather than in response to how the plant is actually growing. When in doubt, wait.

How MNCC Teaches Pruning Hands-On

We don’t just talk about node counts and cut angles in a classroom. Our cultivation track puts pruning directly into students’ hands, because reading about a clean topping cut and actually feeling the resistance of healthy stem tissue are two different skills entirely.

Students in our cultivation courses practice sterile technique, node counting, and timed recovery checks on real plants, often during site visits to active grow operations here in Minnesota. Our programs are tuition-free, funded through state grant support, so cost never stands between a Minnesota resident and the hands-on skills this industry actually requires. If you’re managing clones at home, our clone care guidance walks through the early handling habits that make later pruning decisions easier.

The habits students build in the lab, checking a cut site daily, logging when new growth resumes, resisting the urge to intervene too soon, are the exact habits that separate a strong home harvest from a stalled one.

How MNCC Teaches Pruning Hands-On — overview diagram

A Practical Pruning Timeline You Can Copy

A Practical Pruning Timeline You Can Copy — overview diagram

Here is a compact version of the schedule we walk students through: top or FIM at node five or six, begin LST a week later, keep re-tensioning branches every few days through mid veg, lollipop the lower third in the last week before flip, and stop major defoliation once buds start forming.

Pro Tip from our instructors: Vigorous photoperiod strains can absorb an extra week or two of veg time to recover fully from topping before you flip to flower. Slower strains, or growers on a tight timeline, often do better skipping the second round of HST and leaning on LST instead. Grow space matters too. A cramped tent rewards aggressive LST and mainlining to control height, while an outdoor plot with room to stretch can handle a heavier hand with topping.

— MInnesota Cannabis College

Ready to Learn Pruning Hands-On?

Reading about node counts only gets you so far. If you want to build real muscle memory for clean cuts and canopy training, our workforce training programs put you in a working grow room, not just in front of a slideshow, at no tuition cost to eligible Minnesota residents.

MNCC

Our cultivation track covers pruning alongside the compliance and plant care knowledge you need to work professionally in the industry, and our grow-at-home classes offer a shorter, lower-commitment way to practice these techniques on your own plants first. If you’re growing at home in Minnesota already, our home cultivation guidance covers what’s allowed under state rules before you pick up the shears. For a broader look at gentle, structural pruning approaches outside the cannabis world, Lushy Gardens’ guide to indoor plant pruning is worth a look too. Whichever path fits your goals, career training or personal grow, start by visiting Minnesota Cannabis College to see which program matches where you are right now.

Sources

Disclaimer: This content is provided by Minnesota Cannabis College, a 501©(3) nonprofit organization, for educational and informational purposes only. Nothing in this post constitutes legal, medical, or financial advice, and no reader should act or refrain from acting on the basis of this content without seeking advice from a qualified professional. Cannabis laws and regulations are subject to change, and readers are responsible for verifying requirements applicable to their circumstances.