I am having the same issue. Pineapple kush. 24 hours of light. under a 430watt HPS. I realize HPS is for flowering but I wanted to give these suckers a boost for a couple weeks. Only a couple are starting to flower. Others are perfectly fine it makes no sense. Same nutrients,
General hydroponics. 3tsp Micro 2tsp Grow and 1tp bloom, I reduced the amount of bloom to 1/2 tsp when i started to see white hairs on a few new growth points. I rinse the dirt with straight PH'd water every other watering to prevent any buildup/lockup. I have yet to even flower one of these yet They were under fluorescent, Been under the HPS for 2 weeks. I saw the same thing happen under the fluorescent too. I just tossed them. 2 week old plants flowering and not growing much are just junk. Its sad. Especially when you can only have 12 plants. One thought I was considering was "Root Bound" plants.
I grow them in solo cups till they show good growth then transfer to 1/4 gal square pots for another 2 to 4 weeks. They really take off, Then onto 5 gallon. But yet again i've seen autoflower happen in a 5 gallon, I had a mother that did it. Tossed it. So that kinda throws that out.
Another thing to note. The mother plant stays in veg state. Clones from that mother are autoflowering. So its very very odd. I found a seed of
bigbud that was about 10 years old. Going back to the stone age, I hate all this feminized shit these days.
Would an OLD bulb be a culprit under the HPS? I can see low light under fluorescent being an issue but it does it under both types of light anyway.
Not sure the i phone would take a good enough pic or not. if its really needed I can try to get some pics uploaded.
Forgot to post Temps its a goofy time of year so its hard to get it perfect right now. I have to buy a 300$ AC unit this month Temps have been 80 to 84, As high as 90 a couple times and 40 to a max of 45% humidity, I know its too hot. I will be fixing that soon. But I wouldn't think heat would do it. Since the Florescent room doesn't get over 78. with 40% humidity.
Most of the time under the HPS its around 78F with 40% hum. The ac unit i currently have isn't keeping up.
20 years ago I used to grow 4-way, skunk#1 and G-13, I never once had Air Conditioning/ Dehumidifiers or any kind of environment control and I never had a single issue after 3 years of amazing smoke. These new strains suck!!!!