Cannabis Grow Problems — Page 2
Threads 21–33 of 33, newest first.
Light burn vs heat stress — how to tell the difference?
Top leaves are yellowing/bleaching but the plant isn't wilting or drooping. Tent temp is 78°F which seems fine. Light is a 300W LED at 12 inches. Is this light burn or something…
Stunted autoflower — week 5 and only 6 inches tall
My autoflower is 5 weeks old but looks like a 2-week-old plant. Only about 6 inches tall with minimal branching. Already showing pre-flowers. Did I stunt it? What went wrong?
PH keeps dropping in my DWC reservoir
Running DWC hydro and my pH drops from 5.8 to 4.5 within 24 hours. Constantly adjusting. Using General Hydro pH Up but it won't stay. What's causing this?
Bud rot found on one cola — is the whole plant ruined?
Doing a routine check and found gray fuzzy mold inside my biggest cola. The bud was brown and mushy inside. Is the rest of the plant safe? Should I harvest everything now?
Nutrient burn or deficiency? Can't tell the difference
Seeing brown spots AND yellow tips at the same time. Some leaves have burnt tips (nutrient burn?) but others are yellowing from the bottom (deficiency?). How can both happen at…
Slow growth after transplant — been 5 days with no change
Transplanted from solo cup to 3 gallon pot 5 days ago. Plant hasn't grown at all since. Leaves look OK but zero new growth. Did I damage the roots?
Leaves clawing downward — nitrogen toxicity?
My fan leaves are curling downward like eagle claws. The leaves are also very dark green, almost black-green. Currently feeding full strength General Hydroponics Flora series. Is…
Tiny bugs flying around my cannabis plants – fungus gnats?
There are tiny black flies buzzing around the soil surface of my plants. They're really small and seem to hang out near the top of the soil. I think they might be fungus gnats?…
White powder on cannabis leaves – powdery mildew help!
Found white powdery patches on several fan leaves this morning. Pretty sure it's powdery mildew. Plant is in week 3 of flower. Is my crop ruined? Can I still save it? What should…
Cannabis leaves curling up like tacos – heat stress?
My leaves are curling up along the edges, making them look like taco shells. The tent temperature is around 85°F with the lights on. Is this heat stress? How do I fix it without…
Slow growth during veg – 4 weeks old and still tiny
My plant is 4 weeks old but looks like it should be 2 weeks. It's only about 3 inches tall with 3 sets of leaves. Other people's plants at this age look way bigger. Using regular…
Cannabis plant drooping after watering – what am I doing wrong?
Every time I water my plants, they droop for like 24 hours afterward. They look healthy otherwise — green leaves, growing well. But the drooping after watering is concerning. Am…
Brown spots on cannabis leaves – calcium deficiency or something else?
Week 5 of flower and I'm seeing brown spots appearing on fan leaves in the middle of the canopy. They start as small dots and spread outward. The edges of some leaves are also…