Red Stems?

I believe this is relatively normal. It is sometimes caused by a Nitrogen or Sulfer deficiency. If the leaves are starting to yellow it is most likely Nitrogen deficiency. Sulfer deficiency is seldom deficient because many fertilizers have some in them and cannabis plants don't need much. It seems to me like you are using a fertilizer with a good amount of N so I think it is normal. I am a noob too so take this advice with a grain of salt.

Originally Posted by Mocha Rocha

I believe this is relatively normal. It is sometimes caused by a Nitrogen or Sulfer deficiency. If the leaves are starting to yellow it is most likely Nitrogen deficiency. Sulfer deficiency is seldom deficient because many fertilizers have some in them and cannabis plants don't need much. It seems to me like you are using a fertilizer with a good amount of N so I think it is normal. I am a noob too so take this advice with a grain of salt.

It happens with nitrogen or phosphorus deficiency.

Also it can be genetic, if its on every petiole (leaf stem) then its prolly genetic. Otherwise it might be a def. Also since it just appeard makes it sound like a def. Nothing serious though, very minor.

Also 5-1-1 is not okay for the flowering stag. It is okay to use high N formula the first week of flower but you need to switch to something high in P and K and low in N for example 4-8-8. Lamp

If its purple its just sucking life out of your plant. I pull any fan leaves that have purple stems when I flower. A lot of people think your plant pulls nutrients out of the fan leaves and thats why they turn yellow towards the end of flowering. The reality is that they themselves are using your nutrients to stay alive. If you get rid of them, everything just goes to bud production. If it isnt a purple stem your plant is using it for light consumption.

Originally Posted by wilsoncr17

If its purple its just sucking life out of your plant. I pull any fan leaves that have purple stems when I flower. A lot of people think your plant pulls nutrients out of the fan leaves and thats why they turn yellow towards the end of flowering. The reality is that they themselves are using your nutrients to stay alive. If you get rid of them, everything just goes to bud production. If it isnt a purple stem your plant is using it for light consumption.

Thats a new claim that its better to cut yellowing leaves before they dry up.

So you belive that they are actually wasting nutes and not transferring them? If so they would never yellow in the first place. This is true for immobile elements. But even those can be bound by chelators and moved throughout the plant. Silicon is a good example. Id say always leaves them all they are using up is water, they just continue on the ETC and Calvin Cycle as much as they can but they are still smart enough to transport mobile nutes to the new growth. Otherwise N defs would cause the tops to yellow, see what im sayin mang?