Info:
4X2 SF2000 LED
MG Potting Mix and Espoma Organic Potting Soil
About 30% Perlite
Espoma Organic Plant-Tone All Purpose Dry Granular
Espoma Tomato-Tone Organic Fertilizer
Water pH 6.5-6.6
I mix dry fertilizer in the soil when planting, then I give about 1cup/ month topdress. The first topress is as soon as they show pistils. The plants are green and healthy until they start flowering. Then, all the leaves slowly yellow and die, including sugar leaves. Every strain of my 8 autoflower strains.
I do battle a little powdery mildew but spray with organic fungicide once or twice during veg. The green plant in there was also sprayed. They Akzo do this if not sprayed. There are some fungus gnats being stuck to traps, they don’t seem too bad.
Not nute burn (at least mostly, i do see some N burn). PK deficiency. Specifically K looks like. Potassium. Id boost both. Its that all purpose fertilizer. Weed has nutrient requirement changes as she goes into diff stages.
N - Nitrogen = in high demand during flower. Thats why they were so lusciously green. Healthy nutes for that stage.
Phosphorus - P = in high demand in flower. Makes big huge buds.
K - Potassium = high demands later veg and early flower. Makes healthy roots, stems, etc.
N Shoots, P Fruits, K Roots.
Those hot yellow outside edges look like Potassium deficiency… could be pH is locked out. Could be plants are rootbound. But its about the time weed plants need bloom booster shots. And using one all purpose fertilizer thru a whole grow and seeing the same issue? Id bet its P or K.
Second look there are alot more tips curling then first glance. Yea N burn too. My bad @MidwestGuy
This advice isn’t going to help immediately, but I strongly encourage you to start building your own mix or go completely soilless. Either way, ProMix HP makes a great base. If you want the water-only convenience of soil, you can amend with organic inputs (compost, blood meal, bone meal, rock phosphate, perlite, etc). Or you can treat ProMix like a hydroponic system in that you water with a nutrient solution.
The current setup feels slapdash, and I can’t offer any advice beyond don’t do it like this.
If you are always having problems like that in flowering then time to change something, I’d start with changing the flowering nutes as that’s when you are having issues. I’m seeing a mix of previous burn and current deficiencies. Time to change things up if you want different results.
I would suggest a proper cannabis soil (Black Magic, Roots Organic, or FF Happy Frog) and cannabis nutes such as Advanced Nutrients, Fox Farm, or Jack’s. You can keep it under control throughout the grow(s) that way.
Been having similar problems, bone meal and epsom salt has helped I think. Hard to tell as they are so late in flower and some yellowing is to be expected. The brown splotches was what worried me.
Now
