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Dura don't worry about the sacks, look for banana-like male flowers either in clusters or singles growing out of the buds. The bananas start green and will turn yellow before they're ready to burst.
What strain do you have?
Who is the breeder?
Is it from feminized or regular seeds?
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"can i scalpel the pollen sacks off it and keep flowering till harvest."
Tweezers. Just grab and pull them off the plant, chuck them out.
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"what effect will this have?"
At three weeks you may just have ... a temporary hermie. A few strains will push out a few bananas in early flower then nothing for the rest of the grows. I've had this happen with several strains. With this type of hermie you pluck the male flowers (sacks and bananas) and wait to see if they grow back. Pluck them clean two or three times before moving to the next step.
If it's going to be a full hermie you can either pluck every day - I've had hermies where I've spent literally hours every day plucking bananas - or you can get Dutch Master Reverse and Penetrator. These are a foliar (spray on leaf) treatment that will slow down or completely stop male flower production. Spray only after you're sure the plant will continue to produce bananas after it is picked clean several times, but it's a good idea to have some on hand for late flower.
http://www.4hydroponics.com/nutrients/reverse.asp
"yeild:, strength, etc. i am going to isolate from the rest of my grow( moving it to another house)"
Even if it's a full blown hermie you can slow male flower growth and pluck the bananas, very little loss of yield and potency. If you stay on top of the bananas it's doubtful that you'll get too many seeds, but a seeded plant will put it's energy into seed production over bud and resin production.
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I've got a thread on hermies and how to treat them, if you have any other questions you can post them there or in this (your) thread and I'll help as best I can.
https://www.rollitup.org/seed-strain-reviews/182247-feminized-seeds-hermie-test-14-a.html
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