Now you going to make me go back and find my notes. Si Armor helped make them stronger but it doesnt fill the void, keeping a fan on them from the start helps but there was some thing that filled the pith. I brought it in another forum and one purest asshole said "My stems are never hollow, if they were I would toss the plant". My Buddy Karma set him straight in about 2 weeks when he posted a picture of a freash cut bud with a hollow stem yo ucould put your finger in. Now did I point that out, hell yes I did and he cme back with "well thats becasue I just cut that one" Right. Asshole was probably a politician