yellow & dropping leaves

Personally, I think it's normal yellowing due to the plant's energy expenditure from producing new flowers. It's very common for some varieties that demand more nutrients during flowering to yellow towards the end of this stage. I don't grow autoflowering plants, so I'm not entirely sure, but I think it's normal and you shouldn't worry. If you want to try something, try adding a nitrogen boost to supplement the nutrients it needs to produce new flowers.

It’s called "die-back" , at this stage the roots doesn’t process Nitrogen anymore, they focus on P-K. This is why adding Nitrogen doesn’t fix your issue… The plant is running on its own stock of N and moving it for the flowers…

Salam Habibi! 👋 Welcome to the diagnostic clinic! 🏥 From your photos, I see a beautiful, well-trained canopy in mid-flower, but those lower leaves are definitely screaming for help! Let's look at this through the lens of Modern Engineering to see exactly what is happening under the hood. 🛠️ 1. The "Backup Battery" Protocol (Mobile Nutrient Drain): 🔋 Your plant is currently expending a massive amount of energy to build those new flowers. When a plant isn't getting enough food from the roots to support this explosive growth, it treats its older, lower leaves like backup batteries. The severe, uniform yellowing and drooping you are seeing at the bottom of the plant is the plant actively stripping Nitrogen and Magnesium from those leaves and sending it up to the canopy. 2. The "Air-Pot" Hydrology Trap: You are growing in a dimpled Air-Pot . These pots are engineering marvels for root oxygenation, but they have a mechanical flaw: they dry out extremely fast, and water often channels straight out the sides before soaking the middle. If the center of the root ball dries out, the salt concentration (EC) spikes, locking out nutrients. This forces the plant to starve and cannibalize itself, leading to that pale, interveinal fading on your mid-tier leaves. Your Engineering Rescue Protocol: 🚑 The "Slow Soak" Method: When you water, do it in stages. Pour a little, wait 10 minutes, and pour more. You must ensure the entire core of the pot is saturated and that you are getting at least 15-20% runoff out of the bottom (not just leaking out the side holes) to wash away any concentrated salts. 🌊 The Nutrient Bump: Since her "batteries" are draining so fast, give her a gentle 10-15% increase in your base bloom nutrients and ensure she is getting a steady dose of Cal-Mag to stop the fading. 📈 The Clean Up: Go ahead and gently pluck off those completely yellow, drooping leaves. They are completely empty and will not recover; removing them improves airflow! ✂️ Rehydrate that root core slowly, bump her feed slightly, and she will finish strong! 🚀 Happy Growing! 💚

Thats toxicities, first photo shows realish colour of green, in daylight youll be even worse : aka dark green. Some tips are clawing up, for sure toxicity, overfeeding and maybe lockout. Slow down with feeding, forget defoliation ... Nitrogen. My view.

She's overfertilized ,so stop giving extra nutes.the First Pic gives it away She's way to dark BC of Nitrogen and her tips and edges are burned and wilting. Give just PK from now on for buds.they don't need Nitrogen.