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My two cents on clones:
Do you plan to use the pruning as clones? That's what I assume.
If not, wait 3 weeks if you ask me.
I think I am right though. If you are just pruning then 1 week prior to flower should be fine.
Consider this: nitrogen actually inhibits root growth in clones. So, time your pruning till you are scheduled to give them pure water and run a little extra through then normal. Take the clones the next day...set the plants on the outside of the grow space so they sort of make a border if that makes sense.
The point is to get them out of the direct light. Maybe kill the 1k that day.
When you take your clone, give yourself as much stem as possible, I.e. make your cut close to the plant. Then, come back and make your 45degree angle cut. /
I even slice upward from the bottom most point of the root until it is level with the stem. Does that make sense? Just hold the stem so the point of the cut is facing away. Cut from the hollow center back down toward the point of the stem.
Its called root scaritation or something. It exposes additional surface area and encourages rooting. Then, dip it in the root hormone and stick it in the medium.
Some people would call me crazy for doin all this, but I have had 100% success with this method.
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