Help yellowing Leaves Not sure Why

I got 3 purple train wreck 4 wwxbb and 3 white widow and 1 Og kush and all the lower leaves are turning yellow sum are brown n crispy n are falling of been it flower maybe 2 weeks I have them under t5s temps usually stay @77-82 today got to 90 I got one wwxbb and one white widow under a hps 400w I'll post pics I also flushed them a week ago and haven't fed them anything I don't think since flush I use ff big bloom and and tiger bloom and cal mag

Nitrogen def, possibly also P def.

In the first two weeks of flower, nitrogen is VERY important.

OK someone said it was nitrogen tox so I flushed them so should I feed them some big bloom

chuckie86 said:

OK someone said it was nitrogen tox so I flushed them so should I feed them some big bloom

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So, they were already yellow like that before the flush? It would be very very hard to overfeed N with big bloom/tiger bloom/calmag without seeing other issues first. What is your primary source of N?

I just use the big bloom,tiger bloom n calmag and I use half tablespoon of each but now I would only use tiger bloom and calmag since they are flowering let me see if I got pics of them before

Here's pics of first sign something was wrong I did check on plants for 2 days and bunch of lower leaves were yellow n fell off so I been had some issues early on

Biggest misconception in growing I believe is dropping grow nutes for bloom nutes on the first day of flower. Unless you're using soil with some nutes mixed in with it ---> this will ALWAYS lead to yellowing leave well before its time. I don't pick up the bloom nutes until the stretch is almost complete and actual flowers are starting NOT pre flowers. At that point I'm still using grow nutes but I'm adding bloom nutes with it. I'll reduce the grow nutes and raise the bloom nutes until there's no grow nutes being used at all. (This is about 4-5 weeks before completion each strain is a little different.) This may not work for your brand of nutes but it works great with mine. I learned the hard way plants need plenty of N during the first couple of weeks of flower. But it still takes more N than most brands have in their bloom nutes to keep the leaves green. It took several cycles for my thick brain to trust my eyes and not some SILLY feeding chart. By the time you notice the leaves yellowing with an HPS bulb it's most likely already to late. They'll never regain their green leaves.

I agree with switching early to bloom food will cause problems. I just chopped a plant that didn't have a yellow leaf one.

You will be better off sticking to a balanced feed. Dynagro is good stuff and cheap. On their website you get a quart of foilage pro, quart of protekt, pint of bloom, pint of kln root solution for $19.

That will last quite a few grows. The foilage pro calls for lime 5 ml a gallon but it still works great at 1-2 ml a gallon.

Also flushing without knowing why is a bad idea. It strips the things that regulate pH.

Proper watering technique, or lack of, is also part of your problem.

Keep it simple. Balanced feed, 5-5-5 10-10-10 or something lime that. If a number is off one or two that's fine. Balanced feed from start to finish.

When you use synthetics make sure to get 20% run off from the bottom of the pots to prevent salt buildup.

Water when the pot is light. Let it dry. It encourages root growth.

Keep it simple. The more you love it, the more you kill it.

Oh, and cannabis specific nutes and potions and what not are a gimmick.

I'm a dyna gro guy myself. I just didn't want to preach. But all advice above is also words to live by. I just won't advice anyone on ratios or brands. But I can promise you're not getting those ratios with dyna gro.

ESPECIALLY about the gimmicks. If it's not guaranteed I won't look twice at it.

GOLDBERG71 said:

I'm a dyna gro guy myself. I just didn't want to preach. But all advice above is also words to live by. I just won't advice anyone on ratios or brands. But I can promise you're not getting those ratios with dyna gro.

ESPECIALLY about the gimmicks. If it's not guaranteed I won't look twice at it.

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It's not and even ratio but it has everything a plant needs.

I got some rxgreensolutions samples I like to. They advertise here.

chuckie86 said:

Here's pics of first sign something was wrong I did check on plants for 2 days and bunch of lower leaves were yellow n fell off so I been had some issues early on

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Ok that is damaged old growth, it will never correct itself once in flower and the flush took it with it. Whitebb actually explained it pretty well, you need nutrients thats easier for you to use (balanced ratio) it pretty much takes the guessing game out of primary deficiencies . While you could get away with what you got, it will be more trouble then its worth for a newer grower.
I'm also going to agree with the pro-foliage suggestion, ive used it from veg all the way to harvest with absolutely no issues! Just start off with a light feed and its easy as shit