removal of fan leaves during flowering

Discussion in 'General Marijuana Growing' started by cary schellie, May 15, 2012.

  1.  
    cary schellie

    cary schellie Active Member

    How many weeks into flowering can I remove fan leaves that are covering bud sights, without harming the plant?
    thanks in advance
  2.  
    cannofbliss

    cannofbliss Well-Known Member

    id say no earlier than 6 wks... but that is of course unnecessary... if they are fed correctly about 50% will eventually fall off themselves and the plants themselves will move nutes from the leaves into the bud if they again have been fed correctly and allowed to cycle into its flowering production with reduced amounts of N... ;)
  3.  
    drive

    drive Active Member

    dont those fan leaves eventually become food for the plant if she consumes them then she needs them
  4.  
    smokemupm8

    smokemupm8 Member

    i have both trimmed some fan leaves and left others..But Id only start when shes fully into flower and not needing them. The leaves were bright yellow and drooping some just came away when the leaf was touched, for the most part, they are now useless. The plant takes energy from them to build buds, so you can either trim them close to the leaf or just wait til they curl and pluck em. It made no stress on my plant, i didnt remove them all at once, a few here and there as needed, but some were done for more light to lower buds. Now most sugar leaves are startin to turn also. But just wait til she s established and dont trim alot at once. u should be ok?
  5.  
    batf1nk

    batf1nk Active Member

    Dont trim any mate. I either tuck them away, bend them out of the way or leave them on. The plant needs those leaves at this important time so why rip away the food you have been carefully feeding all through its veg stage? If a leaf wants to come off it will fall off. Leaves are the power station for the plant, why remove the solar panels from which the energy is derived from.

    Happy Growing
  6.  
    Illegal Smile

    Illegal Smile Well-Known Member

    Stupid, stupid Nature! for putting those stupid leaves in the way of the light!
  7.  
    CoralGrower

    CoralGrower Active Member

    Buds are the result of the light hitting the leaves, not the buds.
  8.  
    Opm

    Opm Active Member

    Again, light functionality.

    Light is reduced by 1/4 for every foot you get away from the light. Why remove a leaf closer to the light and absorbing more energy in favor of lower leaves further away.

    If the plant doesn't need the leaf, it will shed it. Give the plant what IT wants, not what you want.
  9.  
    IC3M4L3

    IC3M4L3 Well-Known Member

    i only remove fan leaves if ther discoloured,yellow ect,so the plant puts effort into the flwoering rather than the repairing of leaves
  10.  
    Dwezelitsame

    Dwezelitsame Well-Known Member

    my thery is fans feed stems and stalks
    an are not needed after stretch is over

    sum plants start to shed them like 1/2 through flower
    why not needed

    my thery is only leafs around buds and in the buds feed the buds

    an if you notice i have startd both phrases wit my thery



    i have also done a side by side -removed fans at 1/2 way through flower
    and i saw no diff


    i suggest all try this

    an see for self








    I an I
    Rastafari
  11.  
    racerboy71

    racerboy71 bud bootlegger

    first of all, if plants are fed properly, no leaves should turn yellow in flower.. this is not natural and an internet myth that gets passed on because people tend to feed their flowering plants high phos. foods in flower and stop feeding them nitrogen or give them very little nitrogen in flowering..
    if you were to continue feeding them enough nitrogen in flowering, the leaves should never yellow and die off like many believe they should.. :)

    secondly, the leaves are what feeds the plants and creates buds, not the other way around... when growing, one should only concern themselves with a happy canopy of nice and healthy leaves and nothing else.. don't worry one bit about buds, but rather concentrate on growing as much green, ie, leaves, as you possibly can?? why? because the leaves are what creates the food and sugars that the plant uses to create things like buds..

    check out the thread by uncle ben called gardening tips and tweaks.. i have only read the first 15 or so pages thus far but have already learned tons.. skip all the posts but the ones by the op if you want... i'll guarantee that you'll look at growing in a different light.. :)

    http://www.rollitup.org/advanced-ma...989-uncle-bens-gardening-tweeks-pointers.html
  12.  
    drive

    drive Active Member

    why not get some cfls for side light?
  13.  
    Invertebrate

    Invertebrate Member

    I would leave the fan leaves personally. They serve a function. Removing them does more harm than good in my opinion.
  14.  
    cannofbliss

    cannofbliss Well-Known Member


    well... first of all... yes you are correct about NOT stopping giving the plant N...

    as cannabis is an evergreen and should remain somewhat green throughout its life cycle...

    and the reason why in the later stage of flowering they "should" turn more yellow, is because the "days are shorter and thus less chlorophyll is produced"

    also... cannabis is an annual... especially when (if let flower) will complete its cycle shed some of its leaves (preparing fertilization of ground for nutes for the seedlings it will have produced)... and then die during winter...

    this can be altered since every other dioecious plant is perennial... cannabis can be kept in perpetual growth and chlorophyll production, if left in vegetative stage... or after flowering... the light cycle bumped back to more hours, then what is called "re-veg"...

    however... if you still give them high doses like you did in veg... then ultimately you are reducing your flower production... and you will hurt your yields with excess N...
  15.  
    racerboy71

    racerboy71 bud bootlegger

    how on earth does nitrogen hurt yield when nitrogen feeds the leaves which in turn feeds the plants?? i think you're one of the people who falls for some of those internet myths..
    i was just waiting for you to say that the plants would taste like nitrogen ..
  16.  
    cannofbliss

    cannofbliss Well-Known Member

    try it... take two like clones (so you have same genetic platform to work with for an accurate control)

    feed one the same amount of N you did in veg all the way through flowering...

    then the other... start to dwindle down its N as the plant progresses into the later end of flowering... say where you used 15-20% N in first week of flowering you would work your way down to 5% by week of harvest...

    and tell me whether or not the one that you tapered down N... did in fact have more flower production and greater yield... ;)
  17.  
    cannofbliss

    cannofbliss Well-Known Member


    i hardly fall for "myths" as i have done extensive scientific study on the biology of cannabis... ;)


    i never said that they "dont" need N... i just said as a result of less hours of light the leaves will have "less chlorophyll production"... ;)

    remember its chlorophyll that comes from light that gives the plants their green leaves... not nitrogen... ;)
  18.  
    racerboy71

    racerboy71 bud bootlegger

    check out post 19 in this link.. ub had feed his plants a higher then normal nitrogen dose in flowering.. now when i say higher then normal, i don't mean super nitrogen dosage, just higher then what most nute co's put into their flowering nutes.. he gives the range and ratios in the same post..
    look at the size of those buds, i can't argue with results like that..
    http://www.rollitup.org/advanced-ma...9-uncle-bens-gardening-tweeks-pointers-2.html
  19.  
    racerboy71

    racerboy71 bud bootlegger

    i understand this.. let me ask you this then.. why don't leaves start to yellow off right at the beginning of flowering if it's the reduction of light that causes them to yellow and not 6 or however many weeks later in flower?
    i'm just trying to understand what i read by ub, and you sound like an intelligent m8, i like to ask questions, hope you don't mind..
  20.  
    cannofbliss

    cannofbliss Well-Known Member

    and that is why a lot of plants (especially cannabis) have additional pigments (xanthophylls (yellows) and carotenoids) which are the accessory pigments that feed light energy to chlorophyll "a" from light...

    chlorophyll is almost useless in the green part of the spectrum, and doesn't absorb that colour...

    and that is why most plants are green... simply because of light... ;)

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