What Is Topping Cannabis?
Topping is the practice of cutting off the top growing tip of a cannabis plant so it grows two main colas in place of one. You make the cut with clean snips just above a node, once the plant has 5 or 6 nodes of growth. The result is a shorter, bushier plant with more bud sites and a flatter canopy.
The cut removes the apical bud, which is the source of auxin. Auxin is a hormone that holds back the side shoots below it. Take that bud away and the two shoots at the node underneath start to stretch upward as twin main stems.
when should i top my cannabis plant
This cannabis topping guide covers timing, tools, the exact cut, and how topping differs from FIM and low-stress training.
cannabis topping guide autoflower
Why Do Growers Top Cannabis Plants?
A single main cola gives you one big bud and a spread of smaller side buds. Two or four colas give you more top-shelf flower sitting at the same height under the light.
- More top bud sites: each cut splits one tip into two.
- Even canopy: tops sit at the same distance from the light.
- Shorter plants: useful in tents with low ceilings.
- Better airflow: spread branches cut mold risk.
- Higher yield potential: real gains arrive with extra veg time, since the plant needs weeks to build those new tops.
Topping counts as high-stress training. It cuts living tissue, so the plant spends a few days healing instead of growing. That trade-off pays off when the plant still has weeks of veg ahead.
When Should You Top a Cannabis Plant?
Top when the plant has at least 4 to 6 nodes and is growing fast. For most photoperiod plants that lands around week 3 or 4 from seed, or 2 to 3 weeks after a clone roots.
Check for these signs before you cut:
- Four to six sets of true leaves.
- New growth each day, not a stalled plant.
- Healthy green color with no spots or pests.
- At least two weeks of veg left in your plan.
Never top in flower. Once buds form, the plant stops building new stems and the cut turns into an open wound that costs you weight.
Can You Top Autoflowering Cannabis?
Autoflowers flip to flower on a fixed clock, often at week 3 or 4, so a stressed plant has no time to catch up. If you top an auto, do it once at the third node before day 21, and only on a plant growing faster than its siblings. Low-stress training is the safer route for autos.
Tools You Need
- Sterile pruning snips or fine scissors.
- Isopropyl alcohol (70%) for wiping blades between plants.
- Nitrile gloves.
- Good light so the node is easy to see.
How to Top a Cannabis Plant: Step by Step
- Wipe your blades with alcohol and let them dry.
- Find the newest node at the top of the main stem. Look for the small pair of shoots sitting in the crotch of the leaves.
- Cut the soft stem just above that node, leaving about 1/4 inch of stem above the shoots.
- Remove the trimmed tip. That is the top.
- Keep the plant in veg and skip high-stress work for 3 to 5 days.
- Water as usual. Do not push heavy nutrients while the plant heals.
Within a week you should see two new shoots rise from that node. Each one becomes a main stem with its own cola.
How Many Times Can You Top One Plant?
Most photoperiod plants handle 2 to 4 rounds of topping, spaced 10 to 14 days apart. Topping twice gives four main tops. Topping three times gives eight. Stop topping at least two weeks before you switch to a 12/12 light cycle, so the plant can recover and stretch into flower.
Topping vs. FIM vs. LST
- Topping: one clean cut above a node. Two tops. High stress, slow recovery, tidy result.
- FIM: cut about three quarters of the top growth tip. Often gives four or more tops, but the result is uneven and some cuts fail.
- LST (low-stress training): bend and tie stems with no cutting. No recovery time, softer effect on yield, works on autos.
Many growers combine all three: top once, then bend the new branches outward to fill the tent.
Common Topping Mistakes
- Topping a seedling with fewer than 3 nodes. The plant stalls.
- Cutting below the node and losing the two shoots you wanted.
- Dull or dirty blades that crush the stem and invite infection.
- Topping a sick or pest-ridden plant.
- Feeding heavy right after the cut.
- Topping during the first week of flower.
What Happens After You Top
Expect 3 to 5 days of slow growth. New shoots appear at the cut node in about a week. The plant grows wider, so branches may need support or a scrog net later in flower.
Keep temps steady, hold the light at the right distance, and give a light veg feed. A dry brown cut site is normal callus tissue. A soft dark cut site means stem rot, and you should trim back to clean green tissue.
Frequently Asked Questions
Does topping increase yield?
Topping raises the number of top bud sites, which can raise yield when the plant gets extra veg time and even light. It does not add weight on its own.
Can I root the cut tip as a clone?
Yes. The removed tip is a soft cutting. Root it in a plug or a glass of water if the stem is long enough to hold a node.
Should I top indoor and outdoor plants?
Both work. Outdoor plants get tall, so topping controls height and wind damage. Indoor plants gain an even canopy under a fixed light.