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IN MY HUMBLE OPINION, When a large FAN leaf starts yellowing, say it is half yellow, that means in the photosynthesis process, that leaf has ate nutes, sucked in some LIGHT and made food for the plant and buds and NOW, half of that is gone, or used or consumed. Well, what about the other half? Can it not it's energy still be used or consumed?
AND when it is ALL consumed or used, that leaf will naturally just fall off.
Years ago I tried removing lower fan leaves to allow more Light to penetrate in. When i did, the plant went into shock for a day or two, and quit eating or only ate half as much, and just went on "stand by" mode. Then, after a day or two, suddenly, I saw that big fan leaf replaced by a new leaf, and I saw my plant use the energy to replace that leaf, more than it used it to grow bigger and make more buds or bigger buds.
I now believe that removing fan leaves is pointless, and that a leaf has a purpose and will serve that purpose until it is dead. Then it will fall off.
Don't ever remove fan leaves before harvest for several reasons.
1. The fan leaves MAKE AND STORE energy for the plant. The fan leaves are doing a process called photosynthsis, and it is the most important part or task or job the plant does, to make it grow. They make the FOOD, the sugars and carbs needed to grow.
If you remove a FAN leaf, the plant will stop growing taller until it can replace that removed fan leaf.
Removing a healthy fan leaf is a big waste of time..they are rapided replaced,, unless you are in the last few weeks of flowering.
2. Even if the fan leaves are yellowing in late bloom I do not remove them until they are almost ready to fall off. The yellowing in the fan leaves at late harvest is the plants metabolism at work. She is transferring all stored energy in the fan leaf to bud production. It is the easiest source of energy she has late in life.
its funny i stumbled upon this now, in a couple of days i will be trimming down my plants. i like to lst a week or so before flower and then cut out the under growth and any malformed nodes/stalks at the 2 week mark. i do not remove any fan leaves from the top of the plant. after this i do not cut any thing of till the day of harvest. i usually average a million pounds*.
*accuracy of scale +/- 1,000,000 lbs
Though I don't have a LOT of experience, I'm going to share a bit of what I have learned here and some of it being common sense. Fan leaves are key to Photosynthesis. I remember reading one of DD's threads where he said that he doesn't remove Fan's as they are "Little Sugar Factories". So to me it makes sense to remove buds that will turn out LARF like instead of fans. I do think a lot of it is strain dependent, but in general terms I think a plant is a plant and the more leaves you remove the harder it makes it for the plant to do it's job.
Thusly I think it's better to remove buds that aren't getting any light instead of fan leaves that are. On my current run I removed a few fans, but mostly just got rid of any "budlets" that weren't developing because of a lack of light. I'm blown away by the results.
I remove 1-2-3 fan leaves almost every week for the whole plants life, to exspose tops that need light. At the last week Ill take them all before harvest to get the light down low. This is on bushy leafy gdp plants. Other strains just a few when then blocklight to a big top.
If you want to take alot like vancerz pic, I would loli pop them a little and leave the very bottom fan leaves to get light, no point in letting the light get threw to hit the soil.
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