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1. Top a couple of nodes and use the top as a clone.
2. Normal top and wait for lower branches to grow to use as clones.
3. No topping - wait for lower branches.
4. ¿?
Is that not option 2? How many weeks veg does it usually take you to get a cloneable branch? Maybe it's my growing style but sometimes I'm 8 weeks into veg and still haven't got anything big enough to clone if I don't top.
No option 2 was lower branch, I normally end up taking top branches to lower the tip top of the canopy so lower branches get chance to catch up. Time depends on plants, but most show sex around 28 days so normally a week or so later. I don't think you're behind if you are using lower branches, and I wait for clones to root before flipping their mums properly. So I'm in the same ball park as you I think time wise.
Ah ok - now I see the difference. I don't worry about canopy evenness - a few centimetres more or less between the plant and the sun won't make much difference I've never had a plant show pre flowers that quickly in veg though.
You probably keep them properly though, I used to run a perpetual grow in one space, so seedlings were next to newly flowering, which was next to a halfway flowered plant. Everything under between 10/14 and 14/12 lighting. (Some days I get up later than others). Only cuts get 24 hours of light, so that's prob why mine will show at the first chance they get. Now I'm under led (thanks mars) I tend to just do a crop at a time.