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Help I can't figure out what is going on. This is my second grow and it's not as bad this time. Last time it started right when I switched to flower. This time it started 3 weeks into flower I have two 600w hps cool tubs in a 4x8 tent. They are in coco with advanced nutrients nuts. I've tried everything. I have a AC in the tent and keep it between 76 and 78. With co2 at 1200ppm my nuts are at 1200ppm I go off advanced nutrients chart. My last plant where a lot bigger and these are a little smaller. I'm thinking now they are getting sunburnt. It's only the top leaves mostly the fan leaves. There is a shorter plant in the corner and it is not bad. I'm going nut trying to figure this out. Can anyone help?View attachment 2891433View attachment 2891434

take photos without hps please

It's just the tops like that. The rest of the plant look good

Here is the short plant in the corner farther away from the lights

Those yellow and brown bits always make me think Cal Mag before anything else pal.

Should I get a bottle of cal mag and use it full strength? I'm using advanced nuts connidissour hobby all the way to grandmaster level.

I always supplement with cal mag and epsom salts, cal mag should be fine, mine are on 4ml per 5l. A bit less that the bottle says.

Also on those bad leaves the tips curl up and a few curl down even on the same leave.

Ok cool I'll go get some tomorrow. And do I use with every feed?

How do u use epsom salts to help?

I use coco so I sprinkle a teaspoon over the top and water through when feeding. Its pure Magnesium, they love it.

Helps if you have Calmag issues as I'm sure Cal Mag solutions are 2/1 cal/mag.

welshwizzard said:

I use coco so I sprinkle a teaspoon over the top and water through when feeding. Its pure Magnesium, they love it.

Helps if you have Calmag issues as I'm sure Cal Mag solutions are 2/1 cal/mag.

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Im using coco too. Should I use cal mag just until lot clears up or every feed? Do u think I should do the Epsom salt too?

Tommy123321 said:

Im using coco too. Should I use cal mag just until lot clears up or every feed? Do u think I should do the Epsom salt too?

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I'd deffo use cal mag right through, start on say 2ml per 5 l of water. Use Epsom if you need it later on, the plant will tell you. I do like to use just a touch of epsom right through though that might be my water thats shit

Can anyone help? I'm a first time grower. still working on my setup and am to the point where I am Ready to choose strains. I am seeing that some strains are easy and some are hard to grow. My question is what it it that makes a strain easy or difficult to grow. thinking of starting with Critical kush and Pineapple Chunk. Any advice would be greatly appreciated. Oh, and I'm going to be using soil.

Has anyone used roots organic is this OK to use on young plants

Having some issues on growth the one plant i started 2 months ago is growing but very slow

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Slow grower smh
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Brand new to this site. How do i start a forum?

first post. been a lurker for a while. lots of great info... trying to figure out how to pm. thank you all for the info!

noodle2113 said:

first post. been a lurker for a while. lots of great info... trying to figure out how to pm. thank you all for the info!

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Welcome to RIU. to turn on pm goto My Rollitup in the upper right hand conner then profile privacy and say everyone to everything in there.