Anyone know why this happened

This is a 4 week vegging Critical Kush under 1000 watt HPS fed with sensi A and B pH perfect and constantly 75 degrees. The tops are kind of limp and stringy. Huge fan leaves with tips curling down

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I'm a first time, but my plants are looking sick right now. First week of Flowering. I think your problem is over-feeding or under-feeding. Leaves tend to curl down when they are under one of those two stresses. Your 1000W might be a bit to close. I think a 1000W is pretty big for just a few plants. How many inches away is the light? Also just curious what type of area your growing in and how is your ventilation? Do you have an osolating flan blowing through the room? Check for bugs under the leaves.

Sorry for the bundle of words, you should be able to find your problem if you do a sort of check list with the information I've provided.

Luffy

Heat stress. Put a fan near them!.... also leaves curling down is a sign of nutrient def. What you feeding them?..tips curling down is PH....what is the PH level at?

actont said:

Heat stress. Put a fan near them!.... also leaves curling down is a sign of nutrient def. What you feeding them?..tips curling down is PH....what is the PH level at?

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where did you go to growing school? walmart?

How often and how much do you water?
Is that soil dry when you stick a finger in to the first knuckle?
What kind of pot is it in? Holes in bottom?

It looks like it needs to BE watered.

I water a measured amount (in ml) depending on my pot size, every day at lights on......The measured amount is used up by the plant in 24 hrs to the point that the soil is "dry" down 1" (Knuckle in soil). This method brings 02 to the roots every day - a good thing! As the plant grows it needs more water. This need increases 30 - 50% in flower strain/plant size dependent.

75F at the canopy (?) Is not heat stress.

You should be using a MH or cfl for veg because HPS gives out the spectrum for flowering