How early should i start LST training on my autoflower to get great yield without stressing plant?
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In my personnal point of view, not until the the fifth or sixth internode…
Hoping that helping you @tim245
~Al 
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with Low Stress Training, you should wait till it’s tall enough to bend and guide easily to expose more secondary branches to light.
oops, @Niala, you gave a great answer! I type too slow…
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, we are giving complementery advise, it’s a team work 
I agree with @Niala and @kabongster I would wait for the 5th node but also when it is tall enough to do so, if you have a powerful light the node spacing might be very tight and it might not be tall enough to LST.