Bright green leaf tips from newer growth, any ideas???

They are in veg for few weeks. It only appears on one plant, it started before about a week ago on one top. So i tought it might be light/heat stress. I have 400w mh/cooltube, had it 30cm from tops or even closer, so i started to move the light up, but it didn't help.. It spreaded to more tops now. I didn't use any nutes, as soil is supposed to have enough for some time, so i just add nutes in flowering.. It also has planty of airflow and air movement in room.. I also recently fixed room temps, as i saw minimum as low as 15 degress celsius at night(17 at walls) and had 27 degress at lights on, but only for few days. Tought it might be a problem, but now night temps are around 17 and day temps around 24.. I think this bright green tips are starting to yellow.... Any help would be great.

My pineapple express has done this on me. It was starting to get low on nitrogen. As soon as i feed it the next morning everything greened up. Hope this helps.

Thanks man, i can give it a try with adding a bit of fertilizer in next watering for that perticular plant and i'll see if things get better.

Rush56 said:

Thanks man, i can give it a try with adding a bit of fertilizer in next watering for that perticular plant and i'll see if things get better.

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Make sure your ferts have N as a component though, we've had a few who said 'I'll add a bit of the nutes' and they hit it with everything but a decent N shot that was needed. Decent is not meant to imply any big number... 23-0-0 or 46-0-0 are way overkill for the light mod you need to do, as an aside.

thank for warning, i know i used one that is 7-4-6 i think..N is 7 and highest for sure I added 50% of dose stated on nutes for first time.. Hope it will help, i noticed the problem showing up on second plant too..

Rush56 said:

thank for warning, i know i used one that is 7-4-6 i think..N is 7 and highest for sure I added 50% of dose stated on nutes for first time.. Hope it will help, i noticed the problem showing up on second plant too..

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Sounds good, give it a few and see how she reacts.. should be just fine for the time being and you can continue on with the grow

needs nutes or ph adjust i'd say

Any change?

a difference of more than 10 degrees Celsius between nighttime and daytime can also be a factor.