Nitrogen deficiency and over fertilizing?

my largest plant just started to show yellowing tips. From the reading I have done here it suggests over fertilizing. Then today I noticed the lower leaves are starting to yellow. Which is a nitrogen deficiency

Water ph is 6.0 and runoff is always close to the same


They are in 7 gallon air pots.
Dinafem critical
Pro mix hpcc.
Biobizz nutrients 1/2 strength.

Middle of the plant yellowing is usually a N def. Lower leaves yellowing and turning brown and crispy is over watering. tip burn is nutrient burn. Now you can see to back off the nutes just a smidge

Big smo said:

my largest plant just started to show yellowing tips. From the reading I have done here it suggests over fertilizing. Then today I noticed the lower leaves are starting to yellow. Which is a nitrogen deficiency

Water ph is 6.0 and runoff is always close to the same


They are in 7 gallon air pots.
Dinafem critical
Pro mix hpcc.
Biobizz nutrients 1/2 strength.

Click to expand...

I noticed the tips about 3 days ago.
24 hours ago I noticed the lower leaves were starting to yellow. Fed them yesterday and today the lowers are much worse.

Diabolical666 said:

Middle of the plant yellowing is usually a N def. Lower leaves yellowing and turning brown and crispy is over watering. tip burn is nutrient burn. Now you can see to back off the nutes just a smidge

Click to expand...

Should I flush then add more nitrogen only?

Big smo said:

Should I flush then add more nitrogen only?

Click to expand...

fuck no, never flush a plant (thats overwatering and it will throw all kinds of issues)

First grow and Freaking out big time. Like an idiot I went all in. Room, lights, pots everything I sort of spent 3 times my initial budget. Results this far are amazing.
Now this.

What gets me is the issues are on the biggest plant. If anything I would think it needs more than the others. But the yellow tips means it's getting to much.

Flushing is for toxicity issues.

For deficiency flushing will only make the problem worse.

For the most part, the lower fans always, always, yellow up and die. That is ok. Pay attention to new growth. If new growth is yellow then you have N def. Your leaves are very dark green.

Back off on the nutes and increase time between waterings.

Tip burn IS NOT A PROBLEM.

Thank you for your time diabolic and super bak3d

Just to clarify.

Tip burn as long as it remains on the tip is actually what you want your plants to have, it means they're right at their max tolerance level, the trick is maintaining that level without going over.

Tip burn is ok, but if it consumes the edges and starts covering the leaf, then you've gone too far.

Watch this VIDEO Tips & Stripes!
Magnesium issue possibly. (I can see stripes on some of those leafs)
Only you will truly know because you are the one feeding it.

Your saying you feed:
"Pro mix hpcc.
Biobizz nutrients 1/2 strength."
Are you doing this at every watering? Becuase Pro-Mix is to be used as a soil-less medium. Meaning to be fed every watering. Use the Drain to Waste recipe for your nutes. Your PH is good for soil-less.
I don't think it's a burn because you're at half strength and you show no other signs of stress.
Don't take my word for it but I would look at what you're doing and what your using as a medium and then do some more reading or call Pro-Mix and ask them how you're supposed to feed in that medium.

It doesn't need to be this far gone to tell. You can see it faintly in your picture.

Pro-mix hpcc is the soil and yes 1/2 the recommended. A little less actually. Doing the conversion from gallons to liters I always round down even if it is 5 extra pure liters of water.

Have you always used half and Pro-mix and had no issues? Also, were you growing the same strain?
I have found in soil or soilless mixes that Big Buddha cheese needs tons of CAL/MAG and Nitrogen.
This may be the case for you also.

This is my first grow. The promix came right from the bag. And actually now that you asked it sort of clicked. The largest plant is the one with the yellow lower leaves and yellow tips and it also the only one that's different than the others.
5 Girl Scout cookies
5 vast and fast
1 dinafem critical. Huge plant

I will try and adjust the led to get a more accurate blurple-less photo when I return home

That's a full shot and a closer up picture of the one with the tips. Day 37 since the first one sprouted.

Just had a thought and it's probably a wrong one but could it be from light at all? I started with 2 cheap Ipower 600 mh then switched to 2 Mars hydro 600's and the mh and now again switched to 2 kind k5 1000 watt panels. Probably fucked them up by changing so much but I couldn't take the first 2 options much longer. Could there be to much light for these girls under the new LEDs?