Leaf curling and yellow-brown spots?

Hi looking for some more advice.

Any idea what could be causing leaf curling on one and yellow spots on another? Not sure where to begin?! Ph is good at 5.9 on the one with lots of spots. Cal mag deficiency? Heat stress?

Much appreciated


If soil 5.9 low for ph. 6.3- 6.8 better for soil. Also thick girls. Auto? If photo a good cleanup inside and bottom. If auto maybe some airflow pruning inside and bottom. If auto not a lot. Photo can get away with more.


Can you give more details?

More of this can help us help you. :v:


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 - ilgm sunset sherbert, skittlez, gelato.

• Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF: ffof soil

Soil brand and type

• Vessels: Pots, Grow beds, Buckets, Troths: pots

• PH of Water, Solution, runoff (if Applicable) runoff was 5.9 this evening which i know is low, using ph up right now to bring ip

• PPM/TDS or EC of nutrient solution if applicable: not sure how to measure this.

• Indoor or Outdoor: indoor

• Light system: 2 marshydro ts2000 lights 300watt.

• Temps; Day, Night: flucuates 70 to 86

• Humidity; Day, Night: fluctuates 55 to 70

• Ventilation system; Yes, No, Size. Yes, mars hydro vent that came with the tent.

• AC, Humidifier, De-humidifier: floor air pusher and ac

• Co2; Yes, No- not sure what thus is asking.

Always try to upload a clear picture of any issues you may have to allow the community to assist you. Pictures taken under natural or white lighting are by far the best.

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.

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Thanks for that!

PH at 5.9 is a bit low for soil - if you can feed 6.5 pH when you water, that’s the goal for soil plants.

As far as tds/PPMs, check out Amazon, just search “tds meter” and you’ll find a variety of cheap digital ppm pens. It’s designed to give you a ballpark amount of total dissolved solids (tds) in your water. That’s how we rule out under/over feeding.

Now, I can say with more confidence it looks like two things: the leaves look “burned” almost like they got a bit of nutrient liquid or pH up/ph down spilled on them.

They also look like the leaf surface temp may be too hot. How close/far are the lights from the canopy?

The lights are 24 inches above the top of the plants.

Ill also look into the pen.

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Try raising your lights up another 6-8” and see if your leaves still taco in (they’re kinda making a soft V shape). One thing I’ve noticed about Mars Hydro and some of those other more common Amazon lights is that, while they aren’t bad quality, they emulate the problems of old HPS/MH bulbs by generating a lot of heat instead of converting that energy into light. Your space may benefit from a couple extra small desk fans blowing directly on the light fixture and just above the canopy to circulate the air. It won’t cool down the tent, necessarily, but it will help to reduce leaf surface temperatures by moving the hot air off the leaf surface and replacing it with recirculating air more frequently. Air exchange is a big deal for these plants, especially in closed and tightly controlled environments like our grow tents. :slight_smile: