Topping Autoflowers - why and how

Topping an autoflower is a choice. If you have the room and height to let her grow then the choice is yours. If, like me you have vertical restrictions then you might want to consider topping. There are many threads in AFN about topping (@autobeast is one of them) but I just thought a quick demonstration with the results after a week would give first timers the confidence to give it a go. When ever and where ever you top the plant will give you different results. Each set of large leaves off the main stem will produce a side branch that will turn into a small cola, this is called the node. The more light this cola gets, the bigger it gets but never usually as big as the main central cola. If you top the plant, the main cola is removed but the plant then thinks it is damaged and all the smaller colas then start to develop more quickly to try and get above the canopy of the plant and take the place of the main cola. The result is many main colas that are slightly smaller than the original cola would have been.
How many colas you get depends on which node you cut above. The lowest two leaves produce the smallest and weakest of these colas and (in my experience) with LST these almost never catch up to the rest. If each node produces two colas then for every node below where you top you will have 2x the number of nodes left on the stem. I top at the 5th node which gives me 10 main colas. Some top at 4 and some at 6. I have found the more colas you have the smaller each cola is likely to be.
Once you decide or try different ones to suit yourself, allow the plant to grow enough above the node so you can get your cutting implement of choice in the space with out damaging the rest of the plant. Then simply cut the top off. My plants stall for a day then off they go again. I will update this page with one I did 12hrs ago with 12 hour spacing photos for a week so you can see the progress.
Below is a series of pictures showing the topping process.
Selecting and showing the nodes
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The main cola to be topped
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Topping the main cola
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Sent from my comfy chair.
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I usually cut at the 5th but sometimes she gets fimd. Hard to tell because i try and cut off as lil as possible. I run a 400w hps with eye hortilux bulb. 3 300w mars hydros all in 3x3x7 lol. I usually dont run the leds 24hrs
 
Update? Would love to know how this plant is finishing. Thanks
 
...The lowest two leaves produce the smallest and weakest of these colas and (in my experience) with LST these almost never catch up to the rest...

So far I've found it can go either way my current topped at 4th node plant, the lowest branch has developed into the largest cola, though it's partner branch is ordinary.

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Great article. Sound information. Good job :d5:

Frank
 
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