Picking Males

I’ve got my eyes on some F4’s for father stock. Wondering if the pollen from an F4 male is still potent/viable? No point in buying them if that far down the process the pollen is compromised. Thanks for the input
 
Mr. Green Pants said:
In my experience, all plants, male and female, have presented with hollow stems.
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Mine certanly not. I have had a few without hollow stem. Might also depend on when to check that. I usually only keep males until they are week 3 or 4 and most dont have a hollow stem at that point
 
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