HELP! Fan leaves yellowing!

Fan leaves have started to yellow and fall off. I had been feeding with fish fertilizer (3-1-0) and watering with well water since it’s been dry here with little rain. After reading some information from ILGM I switched to a 20-20-20 fertilizer last week but I haven’t noticed any change.

Is it a nutrient deficiency? Over watering? This is only my 3rd time growing so I’m still pretty new. I have 1 tablespoon of fert in a gallon of water. Perhaps I need to dilute the fertilizer further?

@Myfriendis410 and @Covertgrower


calcium, magnesium, probably phosphorus, potassium, and I’m seeing thrip damage when I zoom in. Highly recommend jacks dead bug. Or any other product with spinosad as main ingredient.

Cannabis needs all NPK’s, willing to bet since you started feeding you won’t lose any more leaves. Hope this helps.

Experienced community members and expert staff will be better informed and more capable of providing a more informed answer.

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:


  • Strain: Durban Poison from ILGM
  • Method: Organic soil
  • Vessels: Pots
  • PH of Water, Solution, runoff (if Applicable) N/A
  • PPM/TDS or EC of nutrients : N/A
  • Outdoor
  • Temps; Day: 75°-95°, Night: 65°-75°
  • Humidity; Day 45%-70%, Night 60%-85%
  • Ventilation system; N/A
  • AC, Humidifier, De-humidifier, N/A
  • Co2; Yes, No N/A

Sounds about right.

Aside from continuing to feed with 20-20-20, what else should I supplement with? Thanks in advance!

Calcium. And magnesium.

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