Do these spots mean I have a problem or do I need to start feeding?

  • What strain, Seed bank, or bag seed: ILG Jack Herer
  • Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF:Fox Farms Ocean Forest
  • Vessels: Pots, Grow beds, Buckets, Troths: 3 gallon fabric pots
  • PH of Water, Solution, runoff (if Applicable): NA
  • PPM/TDS or EC of nutrient solution if applicable: NA
  • Indoor or Outdoor: Indoor
  • Light system HLG 100v2
  • Temps; Day, Night 77 - 72
  • Humidity; Day, Night? 50 - 60
  • Ventilation system; Yes, No, Size: Yes 4"
  • AC, Humidifier, De-humidifier,: No AC, humidifier in room but not in tent
  • Co2; Yes, No: No

These spots just showed up today. I had noticed the purple/red stems but I wasn’t aware that might be an issue. This plant is 18 days old. It has never had nutrients so that should eliminate a toxicity. I did get what I thought was a nutrient burn shortly after the plant started growing. I read where that could happen on new plants in a rich soil. Is this a magnesium deficiency It is only on one of the middle leaves. 2 of the lowest leaves have brown shriveled tips. Everything but 4 leaves look good.

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A picture so we can see the spots will be helpful.

Purple / red stems is normal. You should be fine in Ocean Forest so long as you have not added additional nutes.

The chart below might help, but be aware that other conditions such as having your light too close to the plant can also cause problems at the tips.


I tried but I must have done it wrong. 1st time using this forum.

Are you spraying the plant with the light on it? Beads of water can act as a magnifying glass and cause that type of spotting.

You don’t need to start feeding a plant at that age with Ocean Forest. The problem has to be something else.


It looks like a perfectly healthy plant otherwise. You have good coloration and healthy new growth, and it doesn’t appear that you are overwatering.

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I have accidentally gotten some water on my plants when I’ve watered. I thought I had brushed it all away. I guess I’ll take a wait and see approach. Thanks for the insight.


It doesn’t look like you really have anything to worry about. Be careful when watering and avoid nutes for a while. Keep an eye out for other possible problems and keep us posted.

A lot of people using OF don’t introduce nutes until they get near flowering, though things like silica and seed sprout tea will be fine in moderation at this point.


It reminds me of water drops on the leaves and the light started burning the leaves. I grow only in FFOF soil.


Do you water with RO or distilled water? I don’t know much about soil growing but when I see that in coco it usually means It’s time for some cal/mag


I use distilled water and grow in soil.

Keep an eye on her if it continues to spread I’d look into adding some cal/mag

I use this exclusively as well. Only during the last few weeks will I supplement with GH nutes