yellow leaves

Hi All,

This is my first grow and i have 3 plants under a 600 watt light and they are 3 weeks and 4 days into flower, ph is 5.6 and temperature is around 28c. Until now i have had no problems but when i went to check on them this morning i noticed that some are the top leaves are turning yellow(see picture)this is the tallest of my plants and is the closet to the light, could this be too high temperature or something else? any advice would be much appreciated. Many Thanks.

It looks like some sort of nutrient imbalance.

tems?what are u growing in? what is the nutes your useing?ec?

how far from light is it?

im using a 1 x 1 x 2 meter grow tent and using coco a and b for nutes.The light was about 5 or 6 inch away from the top of the plant but i have moved it today and it is now about 12 inch above the plant.

Hi I have a similar problem with a much younger plant. It has now produced some bright yellow new leaves sprouting from the top of the 3 week old baby. I moved it further away from center and raised my 600 HPS a couple of inches, thinking it was probably getting to hot at the top of the plant.

I am sorry I cannot help you out here being that I am a new at growing, but rest assured hopefully we will both find an answer and a solution. Good luck.

Heat stress, keep the light about 30 " from plants

dude its either a magnesium or a zinc deficiency check it International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!

Chemical Ali™;826039 said:

Heat stress, keep the light about 30 " from plants

Click to expand...

agree...

Or ec is to high<<<