Leaves curl up and then go back to normal

Leaves are curling up no matter what I do put my 1000 HPS light 40 inches away have been watering with my spring water 7.5 PH. There in 3 gallon pots with potting soil mixed with peat moss. I have been using miracle grow 1x a week…There in my basement and I had humidifier going but shut it off to see if that would help.

Your ph is to high and the leaves cupping is from excessive heat.

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https://www.ilovegrowingmarijuana.com/marijuana-heat-stress/

I second @Painfree. Curling is a sign of high heat and your pH is way too high. Two separate issues.
Mix your nutes, then pH, then adjust the pH. I like the 6.3 neighborhood. It’s a nice neighborhood with good weed on every block.

You got a great diagnosis.

I would strongly suggest ditching the MG and getting on a correct nutrient program. You need a digital PH and TDS meter as well.

How about filling this out so we all have an idea of where you are and where you need to go?

COPY/PASTE the below list into your forum post.

Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so; Or post
NA (non applicable)

  • What strain, Seed bank, or bag seed
  • Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
  • Vessels: Pots, Grow beds, Buckets, Troths
  • PH of Water, Solution, runoff (if Applicable)
  • PPM/TDS or EC of nutrient solution if applicable
  • Indoor or Outdoor
  • Light system
  • Temps; Day, Night
  • Humidity; Day, Night
  • Ventilation system; Yes, No, Size
  • AC, Humidifier, De-humidifier,
  • Co2; Yes, No

Always try to upload a clear picture of any issues you may have to allow the community to assist you.

Add anything else you feel would help us give you a most informed answer should be included. Feel free to elaborate, but short and to the point questions and facts will help us help you in a more efficient manner :slight_smile:

Thanks!

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