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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thanks for the good thread! I've never topped an auto. I'm thinking seriously about it though. I'm growing the big ones so big now, pushing the greenhouse envelope. And am planning more Bubba Trouble in larger pots which puts them closer to the ceiling
 
thanks for the good thread! I've never topped an auto. I'm thinking seriously about it though. I'm growing the big ones so big now, pushing the greenhouse envelope. And am planning more Bubba Trouble in larger pots which puts them closer to the ceiling
Thanks, hopefully it relieves some stress if you do.

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Sorry to go off topic, but I cant help drooling at how healthy your plants are !!!!
Could you divulge what medium you are using and something about your nute regime.

Thanks in advance :clapper::clapper:
 
Sorry to go off topic, but I cant help drooling at how healthy your plants are !!!!
Could you divulge what medium you are using and something about your nute regime.

Thanks in advance :clapper::clapper:
Thanks for the compliment. Here is my perpetual thread, the soil is 2nd or 3rd post and nutes at post 5. I'm a soil and old timer guy. Also I don't use PK 13/14 anymore and am trying topmax but do not see a difference.

https://www.autoflower.org/index.php?threads/63634/


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Many thanks for your prompt reply....I've had a good read of your perp. thread and I'm going to do the same now I have got my indoor set-up ready to go. 2 small points .....
* For topping at node 5, do you count the cotyledon leaves as node 1 ?
* Approx how much water does your seed sit in for germ.....I want to try the 1/8 aspirin method but dont want to overdose.
Cheers
 
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