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The yellowing is normal. Toward the end of the plants life cycle they start to use their stored energy which causes the yellowing.
Later in flowering your plant will start to develop more color like the plant in my update. It looks pretty green in natural light (not as green as when it was younger) but bleached under the HPS.
-------------------- “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” -Dr. Seuss
Yes yellowing starts at the top because it's closer to the light which means it uses more energy. The plant is using stored nitrogen which translates into a little less chlorophyll. A little less makes a big difference in terms of color contrast from the top to the bottom.
mhbound: I understand that ideally you want them green from start to finish. But I think it is more strain dependent. The strain I have flowering now starts a slow yellowing beginning in week 2 of flower. There's nothing you can do to stop it. The ones I have in veg right now stay dark, vibrant green right to the end.
I just went through this myself. In week 2 of flower my girls started to yellow. So I started feeding extra with high Nitrogen and they continued to yellow (slowly). What happens here is that the plant TAKES UP less N during flowering (even if the N is there it's not being used). So this N builds up in soil instead, which in turn causes overfeeding.
Come week 4 1/2-5 of flower 1 plant starts to randomly die out of nowhere. Looks like overfeeding so I stop feeding all of them because I don't want the other 10(9) to follow suit. The one dying continues to die and gets the chop as one more follows it.
So NOW it looks like I have an underfeeding problem in the rest of my plants because they're not finishing as strong as they should. I can't feed them now because it's too close to harvest. Lesson learned.
That's why I think it's strain dependent. With my current plants, there is NOTHING you can do to keep them from yellowing. They also keep growing from the top. My NEW ones will stay green right through the end of flower. They stop growing and finish up all at once.
Here's a bud from my yellow fellows. Dosen't look look yellow now, does it?
DudeTron: Don't mess with it too much. You don't what to mess up what you already have. Keep the light close and keep doing what you're doing.
Wow, I'm high. /end rant
-------------------- “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” -Dr. Seuss
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