Cannabis Topping vs LST: Which Training Method to Pick First
Compare cannabis topping and LST. Learn which training method to pick first, what to look for in tools, and common mistakes to avoid.
When to top cannabis: the short answer
Top cannabis when a healthy plant in vegetative growth has 4 to 6 true nodes on the main stem. For most photoperiod plants that lands 3 to 5 weeks from seed, or 1 to 2 weeks after a rooted clone settles into its final pot. Cut just above a node and the single main tip becomes two growing shoots. Do not top in flower, do not top a seedling that still has only its first set of serrated leaves, and do not top within 3 to 5 days of transplanting, defoliating, or fixing a nutrient problem. If you are shopping for genetics with topping in mind, photoperiod seeds and vigorous rooted clones give you the most control over when the cut happens. Autoflower seeds can be topped, but the window is narrow and the margin for error is small.
Cannabis Topping vs LST: Which Training Method to Pick First
Why node count beats the calendar
Two plants started on the same day rarely reach the same stage at the same time. Light intensity, root space, temperature, and watering habits all shift the pace. A node count tells you what the plant can actually do. At 4 to 6 nodes the stem has enough stored energy and enough axillary bud sites to push two strong shoots instead of one weak one. Counting days from germination is a scheduling tool, not a signal. Check the plant, then check the calendar.
Timing by grow style
Photoperiod plants
The flexible option. You decide when flowering starts, so you decide when topping stops. A common pattern is one top at 4 to 6 nodes, a second round on the two new tips about 7 to 10 days later, then 2 to 3 weeks of untouched recovery before you flip the light schedule. Stop topping at least 2 weeks before the flip so the new colas have time to even out.
The Ultimate Buying Guide for Cannabis Toppings After Flowering
Autoflowering plants
Autos run on a fixed clock and start flowering on their own. If you top at all, do it early, when the plant has 3 to 4 nodes and is growing fast, and only if it looks vigorous. Many growers skip topping on autos and use low stress training instead, because a slow recovery eats into a lifespan you cannot extend. A stunted auto stays stunted.
Cannabis Topping for More Yield: What to Buy First
What to look for before you cut
- Four to six true nodes, not counting the round cotyledons at the base.
- New growth at the top that is a healthy green with no clawing, spotting, or burnt tips.
- Roots holding the medium together when you lift the pot, a sign the plant is established.
- Steady vertical growth of roughly half an inch to an inch per day under veg lighting.
- No transplant, topping, or heavy training in the past 3 to 5 days.
Parameter bands that keep recovery short
- Stage: vegetative only. Flowering plants do not recover the same way.
- Node count at first top: 4 to 6.
- Plant height at first top: roughly 6 to 12 inches, strain dependent.
- Recovery time before the next cut: 5 to 10 days.
- Air temperature: 70 to 80 F for active growth.
- Relative humidity in veg: 55 to 70 percent.
- Light schedule for photos: 18 hours on, 6 off.
- Last top before flowering: 14 days minimum.
What to have on hand
Clean cuts heal faster, so the shopping list is short. Sharp bypass snips or scissors you keep for plants only. A small bottle of 70 percent isopropyl alcohol for wiping blades between plants. Rooting gel or powder if you plan to root the cut as a clone. Plant labels so you know which tip came from which mother. A pH and nutrient routine you already trust, because a topped plant does not need a new feeding schedule, it needs consistency.
Common pitfalls
- Topping a seedling that has not built enough leaf area, which stalls it for a week or more.
- Topping right after transplant, doubling the stress in one sitting.
- Topping autos late, when the plant has already started flowering.
- Cutting with dirty blades and inviting stem rot or infection.
- Topping again too soon, before the two new shoots have their own nodes.
- Topping to fix a problem. Fix the deficiency or the environment first, then train.
FAQ
Can I top a cannabis plant in flower?
No. Topping in flower removes bud sites you already paid for in light and nutrients, and the plant will not replace them. Do all topping in veg.
How many times can I top one plant?
There is no fixed limit, but most home grows top once or twice. Each round doubles the number of tips and adds recovery time, which matters if you run a tight schedule.
Does topping lower yield?
Topping changes shape more than total weight. It trades one tall main cola for several even ones. In a short tent that trade usually helps, because light reaches more of the canopy.
How long does recovery take?
Most healthy plants show new shoots within 3 to 7 days. Give a full 5 to 10 days before you top again or switch to flowering.