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extremly long floweing onset...?

hi,

i just encountered very strange phenomenon - extremly long flowering onset...till now, i never saw/experienced this...and i have years of experience...

strains are bubblegum, amnesia haze auto, and big bud...i flipped 12/12 at 3 weeks (as usuall for last few sessions), and now its at 27 days of flowering, and flowering is EXTREMLY SLOW...

some big buds still dont have one sigle hair...most have one or two near the top where they usually appear first...but this is day 27 of flowering...i dont have experience with this strain, but i have alot with bubblegum, and in that time buds are usually pretty serious...amnesia automats are out of this story because they are autos and at this time buds are huge...

i havent given alot of N, which can prolong flowering, but in my experience very little, not like this...the only thing that i couldve find that might be potential problem is ADV nutes B-52...i used it last session but later in flowering...it says it should be used during all veg weeks and then after week 3 of flowering till the end or week 6 (not shure, but from week 3)...could it be that B-52 did this? i had more than i needed and thought wtf it cant hurt, so ill feed during first weeks of flower too...

other than that i use ADV nutes conessieur A+B + Zym, used them last 2 session with perfect results...

there is nothing i did in this whole process that is different from my usual routine, that might be considered as a factor for this...only B-52, which i did feed before, but not during first few weeks of flowering...

does anyone have any idea why did this happen...?
 
yep, its happening with 2 strains, so it must be my fault...good ideas/hints but i cant see any problems on any of these...water maybe, but for years ive used tap water that sits for at least 24-48 hours...i can only check PH and EC, and they are the same as always...

light leaks, also i dont think there should be any, cuz room is lightproof, and i cant test it in the middle of session (entering and exiting during dark)...

timers are always correct, i use analogs, and check them daily...

all bubbles started flowering, bigbuds most have also, but its sooooo late, and they overgrown their pots (i see Zn and Ca deficiencies on bigbuds, and i dont think they will pull it through till the end in these size pots), and streched waay too much...all my lamps are 400w, so the penetration sucks for plants of this size...my finished plants are usually lower than these that just started flowering...

so im thinking of throwing out all big buds (which i initially didnt even want to grow, dont ask why i did), and leaving bubbles (they are mostly in bigger pots) and amnezias, and give bubbes double space, LST them on the side to lower them and open them up for more light/penetration/have more bigger collas...
 
i guess i was right about b-52...heres the reply from advanced nutrients, if anyone is interested:

"With some strains, the stress reduction from B-52 could slow the onset of flower.

It is better to begin using B-52 at the 3rd week of flower."
 
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