Hey there. Sorry, the response is going to be long. Indeed, this is not a very good sign. I'll try to explain it as best as I can. I understand your concern. Your plant is not "dying" in the immediate literal sense, but it is in critical distress; it's extremely urgent to act to save your harvest.
We are well beyond "normal senescence." This is a massive deficiency and severe nutrient lockout.
Here’s the diagnosis and emergency action plan:
1. The Diagnosis: Complex deficiency and lockout
Looking at your photos, especially image_8.png and image_4.png, we see several combined issues:
Rapid senescence: Your main buds (image_8.png) are almost "cooked." They are brown, dry, and the leaves are curling. This is a sign that the plant can no longer hydrate or nourish itself properly.
Advanced Phosphorus (P) & Potassium (K) deficiency: The yellow/brown color and the curling leaves are typical of a glaring lack of P and K during bud swelling.
Zinc/Iron lockout: The bright yellow leaves at the top (image_5.png and image_6.png) with still green veins and rust spots indicate a blockage of these micronutrients, often due to a completely unbalanced soil pH.
2. The Emergency Plan (Starting now)
If you do nothing, your buds will finish drying on the plant and become unfit for consumption.
Step 1: Immediate corrective flushing. You need to "wash" your soil. Use pure water (without nutrients), ideally tap water left to sit for 24 hours, and make sure to adjust its pH to 6.2-6.5. Water generously until 20-30% of the water drains from the pot. This will flush out the accumulated salts that are blocking the roots and restore a healthy pH.
Step 2: Check the humidity. With such dry buds at the top but generally moist at the bottom, the risk of mold (Botrytis) is immense. Make sure your extractor is running at full speed and that your oscillating fan is blowing directly on the buds.
Step 3: Adjust the light. If your light is too strong, it will "burn" the dry buds. Move it slightly further away or reduce its intensity to 50-60%.
Step 4 (Next watering, in 2-3 days): DO NOT use "Grow" nutrients. If you have 1 or 2 weeks left before harvest, only water with pure, pH-adjusted water. If you still have more than 3 weeks, prepare a very light mix (1/4 of the dose) of a flowering booster (like PK 13/14) with your pH-adjusted water.
My verdict:
Your main buds are severely affected. The goal is no longer to have a record harvest, but to limit the damage. By flushing now and stabilizing the pH, you will allow the lower buds to finish maturing properly.
Above all, inspect your brown buds at the core to check for any gray mold inside! I hope I was able to help you. Have a great day.