Leaf tips turning brown

Hello I'm new to the forum just wanted to get an opinion on what is causing the tips of my leaves to turn brown. Day 39 of flower low nutes once per week. Thanks in advance!!

Here are some pics

I think that the plant may be hungry. When it starts to yellow older growth, that may indicate underfeeding as it moves nutrients from old leaves to newer ones.

I was thinking that too just didnt want to give it anymore just in case it was burn. Now do I give her more food or just let nature run its course. Harvest is 27 days ish

I agree with GBAUTO on this one. It seems like those are underfed a bit.. over feeding will do it as well but the tree itself will be green.. at least when I burn them lol.. funny thing is I’ve looked at certain grows that are all organic, where you would think the majority of the tree would be the correct shades of green have burnt tips..I hate to see my tips get burnt..I feel like somewhere along the way I failed... AGAIN

Yes I feel the same way right now and I dont think at this point it will help to give them more fertilizer. Oh well better luck next time I suppose lol

Hvnfunbud said:

Yes I feel the same way right now and I dont think at this point it will help to give them more fertilizer. Oh well better luck next time I suppose lol

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What medium are you growing them in?
What nutrients have you been feeding them on a weekly basis and in what amounts per gallon of water are you feeding?

I had it once, like four years ago. I read it was due to tap water toxins like fluoride, after that I cleaned the soil with distilled water also known as Rainwater️️️ Then I just kept on, I did add liquid humate part one and two or (humic,ulmic part1)(fulvic part 2) its written that it chelates or is, I don't know but some how detoxs, due to big words by big word, but after all was well.

Kushash said:

What medium are you growing them in?
What nutrients have you been feeding them on a weekly basis and in what amounts per gallon of water are you feeding?

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I used a different dirt this time and it could be the problem it's called bacctto after researching the dirt it is mostly peat and sand. For feeding I was giving them 6ml in 3 gallons of water divided to 3 plants bio flores 2-2-5 once per week and on week 3 I gave it to them twice. The last time I gave them nutes I changed to big bud 0-1-3 and used 6 ml in 3 gallons of water split between 3 plants. Other than that I water them when they need it as the dirt I am using dont hold water very well.

All 3 plants maybe that will give a better idea

Also thanks for the info so far!

Went ahead and gave them one more feeding today that gives me plenty of time to get them flushed.