Can anyone tell me the cause of this spotted leaf

Using a standard potting mix (obviously not one I will use again), under HPS 1000w light. Have fed the plants nothing except pk13/14 over 2 weeks ago.
Temperatures range from 18 to the occasional 28 degree Celsius mark (2 degrees over optimum level).
I figured it’s too much or too little of something, can anyone advise which please?
Thanks in advance.


you can use @ sign to tag growers, like @Hellraiser or @Covertgrower to help you


Could be a calcium deficiency. How old are your plants or what stage are they in rather? If they are a bit into flower, this is normal. Normal in that they require cal mag supplementation at some point in early flower or they start to show it.


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:


How about an overall picture of the plant in white light

1 Like

Thanks Eagles009, great answer.
I’ll keep that in mind on the next crop. :+1:

1 Like