Hard to say...if your not over watering. PH? not enough K? Could be a lot of things...try filling out the troubleshooting form...the more info the better we can help you! It's a sticky at the top of this section, just cut and paste and fill it out as best you can, we'll see what we can come up with.
TANKJR Reviewed by TANKJR on . Does this look like calcium deficiency or maybe boron deficiency? Pics. I noticed these spots on my leaves today, it must have developed in the last 24 hrs. I actually had this same problem on my last grow and it seemed to go away once I started using flowering nutes but I am nowhere near inducing flowering yet. The only thing I have been feeding it is Neptunes Harvest (2-3-1) every second or third watering. The strain is nirvana northern light. Lighting is 1 90 watt led + 2x42 watt cfl for some side lighting. Temperature is usually around 76 degrees. Soil is Rating: 5