Leaves are Dark green in veg but turn yellow there all of flower

On another note why are my leafs still light green 4 weeks in to flower

Beachwalker said:

^^^^^

All this plus I don't know your products, I use General Hydroponics 3 part but I go from 3-2-1 veg formula to a 2-2-2 transition-to-flower nutrient regimen for anywhere from two weeks to a month, as Rodger said feed that plant when it wants to eat the heaviest, and I suspect you may be going to your flowering nutrients too soon, possibly why you're yellowing too fast ?

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Probably n deficiency cuz bloom cuts back on it like my earlier comment if it is that case, n is mostly for the leaves and stems, p and k are for bulking fruiting bodies (buds), and strengthening stems forgot which between p and k

Roger A. Shrubber said:

the plant is growing like hell, and it will eat itself if you don't feed it.

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This.

On an otherwise healthy and pest free plant, fan leaves will generally turn yellow when:
1. Plant isn't getting enough food for growth.
2. Leaf isn't getting enough light for good photosynthesis.

In both cases, the plant decides to strip and use as many mobile nutrients as it can in the leaf before allowing it to die and drop off the plant.

I would argue that in your case, a lack of nitrogen is the cause, as stoner lore thinks a flowering plant needs a vastly different nute profile than a plant in veg for some reason....which is fucking stupid.

Wilksey said:

This.

On an otherwise healthy and pest free plant, fan leaves will generally turn yellow when:
1. Plant isn't getting enough food for growth.
2. Leaf isn't getting enough light for good photosynthesis.

In both cases, the plant decides to strip and use as many mobile nutrients as it can in the leaf before allowing it to die and drop off the plant.

I would argue that in your case, a lack of nitrogen is the cause, as stoner lore thinks a flowering plant needs a vastly different nute profile than a plant in veg for some reason....which is fucking stupid.

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Idk about vastly but after the stretch the plant doesn't really have much new growth in height or foilage which is why cutting back N and boosting P and K is usually the go to, I hope you're not saying using the same ratio all the way through is ideal as flowering does have slightly different needs.

Well I've been contemplating using a raw nitrogen product at 5 tsp scoops for a 55 gallon tank to try to bring them back to a dark green but being week 4 in wouldn't nitrogen do more harm than good this far in

Randomestguy said:

Idk about vastly but after the stretch the plant doesn't really have much new growth in height or foilage which is why cutting back N and boosting P and K is usually the go to, I hope you're not saying using the same ratio all the way through is ideal as flowering does have slightly different needs.

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No I have 2 different feeding regimens between veg and flower

Don't do that now, I would carry on with what I'm doing. Next time feed a transition formula for 2 weeks to a month (depends on the strain, length of flower, how long in stretch & several other variables) and then change to full flowering nutes

Randomestguy said:

Idk about vastly but after the stretch the plant doesn't really have much new growth in height or foilage which is why cutting back N and boosting P and K is usually the go to, I hope you're not saying using the same ratio all the way through is ideal as flowering does have slightly different needs.

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I use botanicare grow, hydroguard, calmag, silica blast and liquid karma...and botanicare bloom instead of grow them I use all the other early noted nutes but add hydroplex, sweet, sonic bloom, big bud and bud factorx

Beachwalker said:

Don't do that now, I would carry on with what I'm doing. Next time feed a transition formula for 2 weeks to a month (depends on the strain, length of flower, how long in stretch & several other variables) and then change to full flowering nutes

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I will definitely try that next go around

Thank you all for your input, it has been greatly appreciated.

Randomestguy said:

flowering does have slightly different needs.

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I think the grow journals demonstrate just the opposite, as you see so many deficient plants cannibalizing themselves in flower due to unbalanced nute changes made by growers.

Most of the problems start to happen when growers start dropping N amounts in favor of higher P, K mixes in "bloom" nutes and boosters. However, Liebig's law of the minimum demonstrates that growth is dictated not by total resources available, but by the scarcest resource (limiting factor) available. So by cutting back on any one resource, like N, you limit the ability of the plant to uptake and use any other resource, like P and K. The cannibalization of leaves in early and mid flower demonstrate a deficiency of N the plant NEEDS to produce flowers, it also demonstrates that your plant will NOT be able to use the additional P and K from any bloom nutes or "boosters" you are providing for it at the rate you think they can due to Liebig's law.

Wilksey said:

I think the grow journals demonstrate just the opposite, as you see so many deficient plants cannibalizing themselves in flower due to unbalanced nute changes made by growers.

Most of the problems start to happen when growers start dropping N amounts in favor of higher P, K mixes in "bloom" nutes and boosters. However, Liebig's law of the minimum demonstrates that growth is dictated not by total resources available, but by the scarcest resource (limiting factor) available. So by cutting back on any one resource, like N, you limit the ability of the plant to uptake and use any other resource, like P and K. The cannibalization of leaves in early and mid flower demonstrate a deficiency of N the plant NEEDS to produce flowers, it also demonstrates that your plant will NOT be able to use the additional P and K from any bloom nutes or "boosters" you are providing for it at the rate you think they can due to Liebig's law.

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Maybe wrong choice of words, meant reduce n in the ratio as typically a veg ratio will have the highest value being n, whereas in flowering the same ratio might prove to be less effective in full on flowering as the plant does not use as much of it after reaching final size. You obviously don't want to go to a point where it's so low it becomes a deficiency.

Well like I said it really doesn't effect the flowering growth we are week 7 of 9 and they are stacking great resin production is insane and the aroma is wonderful...I think I found the cure for the yellowing and will be testing it next to around.

growitsfun said:

So the description says it all my plants are green and beautiful during veg but lose their green a week into flower any thoughts? It's not really effecting the harvest to much but I know if I could keep them green threw week 6 or 7 of flower they would be better.
Nutes:
Botanicare bloom
Cal mag
Sweet
Liquid karma
Silica blast
Hydroguard
Hydroplex

Sonic bloom
Bud factor x
Big bud

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You went from feeding them with something with N to nothing but bloom boosters.

Get away from all that crap and find a simple one or two part nutrient with a balanced npk along with micro nutrients.

They are hungry for N.

Wilksey said:

This.

On an otherwise healthy and pest free plant, fan leaves will generally turn yellow when:
1. Plant isn't getting enough food for growth.
2. Leaf isn't getting enough light for good photosynthesis.

In both cases, the plant decides to strip and use as many mobile nutrients as it can in the leaf before allowing it to die and drop off the plant.

I would argue that in your case, a lack of nitrogen is the cause, as stoner lore thinks a flowering plant needs a vastly different nute profile than a plant in veg for some reason....which is fucking stupid.

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I think this is SO very true, especially with indoor crops.

Wilksey said:

I think the grow journals demonstrate just the opposite, as you see so many deficient plants cannibalizing themselves in flower due to unbalanced nute changes made by growers.

Most of the problems start to happen when growers start dropping N amounts in favor of higher P, K mixes in "bloom" nutes and boosters. However, Liebig's law of the minimum demonstrates that growth is dictated not by total resources available, but by the scarcest resource (limiting factor) available. So by cutting back on any one resource, like N, you limit the ability of the plant to uptake and use any other resource, like P and K. The cannibalization of leaves in early and mid flower demonstrate a deficiency of N the plant NEEDS to produce flowers, it also demonstrates that your plant will NOT be able to use the additional P and K from any bloom nutes or "boosters" you are providing for it at the rate you think they can due to Liebig's law.

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Thank you for this excellent post, it was refreshing to read thoughts from someone who knows what they are on about!

The npk ratios in the cannabis industry are out of control. Anything higher than 1-3-2 is probably pointless except in more specialized plants. Plumeria likes 1-4-2, for instance, I am not aware of any plants that need more phosphorus than that, though I am sure they exist.

Weed gives zero fucks, I run a ratio of 1-1-2 and 1-2-2 at varying strengths from seed to harvest. But it will grow successfully in vastly varying conditions.

Dear OP, don’t read the manufacturers bottles as gospel, keep your plants happy and they will make you happy. They need N in flower too, those plants are clearly N deficient. They will probably turn out fine, but that’s the cause of the yellowing. They do get yellow at the beginning of flower, new growth yellows as budset is happening, but that’s different.

Randomestguy said:

Idk about vastly but after the stretch the plant doesn't really have much new growth in height or foilage which is why cutting back N and boosting P and K is usually the go to, I hope you're not saying using the same ratio all the way through is ideal as flowering does have slightly different needs.

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Not really very different at all. You can run 10-20-20 (4%Ca:2%Mg) from beginning to end no problem, in fact I would recommend trying it.

You guys all say nitrogen and I respect that but I'm leaning torwards mag..

growitsfun said:

You guys all say nitrogen and I respect that but I'm leaning torwards mag..

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lol why... even... ask... the.. question??


and you may have mag issues but those pictures appear to be a hungry plant.. but you probably know more than the collective us so I will leave you to it

blowincherrypie said:

lol why... even... ask... the.. question??


and you may have mag issues but those pictures appear to be a hungry plant.. but you probably know more than the collective us so I will leave you to it

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That behavior is what I call being an askhole. A person who asks for input, and no matter how well-reasoned and politely it is delivered, rejects it in favor of their own admittedly ignorant theory, is an askhole. There is no hope for and no reason to help people who go full askhole. OP, turn away from the dark side of the force and learn how accept some good fucking advice graciously, before it’s too late.

Lol magnesium, errybody always talkin ‘bout magnesium, there’s probably enough Mg in your tapwater, bruh

blowincherrypie said:

lol why... even... ask... the.. question??


and you may have mag issues but those pictures appear to be a hungry plant.. but you probably know more than the collective us so I will leave you to it

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I ask because I had no idea at the time and due to the research I've done since posting this is telling me it's a mag problem..not being an askhole.