I have been struggling to figure out what is causing this ever since I started growing. It has occurred every grow. 5 so far. I make it through veg with nice happy healthy plants, switch to flower and within 2-3 weeks these spots start developing. Typically on lower fan leaves first until eventually it starts going after sugar leaves. All but one of my harvests have produced good smoke, but I suspect my yields are suffering. And the plants are clearly stressed.
I grow in coco. I have used soil once and still had this issue. I started with foxfarms nutes then switched to GH flora series. I just use the basic three part. Although I add cal mag due to this looking like a calcium deficiency. I originally used nutes at the full recommended strength. At some point I cut that in half and have noticed no change whatsoever in the plants. I have a 2x4 growing area with a 4" intake and a 4" exhaust fan. 2 blower fans, one pointed at the lights to help with their passive cooling and another at the plants for air circulation. I am indoors, so climate controlled. 65 at night, it gets around 75 in the grow room with the lights on. I water daily with nutes in every watering. I check runoff and adjust the pH of my input to be between 5.5 and 6.5 depending on what the runoff was at the day before. I am using a total of 350w LED lights actual draw. I thought it may be too much light so I raised them and turn it all down to 50% intensity a week ago. I run a dehumidifier in the room and the humidity stays right at a constant 50%. i have also switched at some point from blurples to full spectrum lighting.
So I have checked temp, humidity, light, ph, watering frequency, and airflow. I am completely stumped.
For what it's worth I grow outside each summer using the exact same medium, watering technique, ph, and fertilizer, and I don't have this problem. It is something specific to the grow room. Any help would be incredibly appreciated. I can't figure out what I am missing.
I grow in coco. I have used soil once and still had this issue. I started with foxfarms nutes then switched to GH flora series. I just use the basic three part. Although I add cal mag due to this looking like a calcium deficiency. I originally used nutes at the full recommended strength. At some point I cut that in half and have noticed no change whatsoever in the plants. I have a 2x4 growing area with a 4" intake and a 4" exhaust fan. 2 blower fans, one pointed at the lights to help with their passive cooling and another at the plants for air circulation. I am indoors, so climate controlled. 65 at night, it gets around 75 in the grow room with the lights on. I water daily with nutes in every watering. I check runoff and adjust the pH of my input to be between 5.5 and 6.5 depending on what the runoff was at the day before. I am using a total of 350w LED lights actual draw. I thought it may be too much light so I raised them and turn it all down to 50% intensity a week ago. I run a dehumidifier in the room and the humidity stays right at a constant 50%. i have also switched at some point from blurples to full spectrum lighting.
So I have checked temp, humidity, light, ph, watering frequency, and airflow. I am completely stumped.
For what it's worth I grow outside each summer using the exact same medium, watering technique, ph, and fertilizer, and I don't have this problem. It is something specific to the grow room. Any help would be incredibly appreciated. I can't figure out what I am missing.
