Browning and drying out leaves. Natural, potassium deficiency or nutrient burn?

From what you’re describing, this looks like a classic potassium (K) deficiency moving upwards, but it’s not a true deficiency – it’s caused by potassium lockout from salt build-up in the medium. 📌 Symptoms you mentioned: Brown, crispy edges on the leaves Leaves drying out and falling off Starts from the lower leaves and moves upward ➡️ This is not caused by light, shading, or pests, but because the plant can’t properly take up potassium due to high salts in the root zone. ✅ What you can do to fix it: 1️⃣ Water with low EC solution (or plain water + CalMag) to reduce salt levels in the medium. Not a full flush, just enough to lower the stress. 2️⃣ Feed with a more balanced nutrient solution, avoiding heavy Bloom boosters which add extra salts and worsen K lockout. 3️⃣ Measure the EC of the runoff: 2.2–2.4 mS → likely salt lockout 3.0 mS → full flush may be needed 4️⃣ Add a small dose of Alga Mic or another K supplement without extra nitrogen to help recovery. 💡 Bottom line: Not normal leaf shedding Not a light problem Not pests It’s potassium lockout from salt build-up, starting low and moving up what medium you’re using (soil or coco), ?

Issue with the roots. IMO

some ruzzian troll is talking crap. its obvious phosphorus issue, some potassium is crawling too. for fun try to google septoria, if youll find not round/ circle version of it, text me please. i had my this years harvest damaged by septoria, i see trees eated by it every year around my city ...

unforcunally this is Septoria. notice the round spots on 4th pic, remove all damaged leaves immediately, then spray all the leaves with some milk. Google septoria for more. gl

Build up of nutrient salts from not getting adequate run off each time you irrigate would be my guess. Basically, substrate toxicity and nitrogen over feeding.

Kontrollier auch den EC wert des runnofff wen er über 2 liegt weißt du das du zu viel Salze im Boden hast und eventuell flushen must

Hi, Ja es sieht nach einem PK Problem aus aber warscheinlich Richtung Kalium. Das Beginnt unten und die Blätter verfärben sich Un sterben dann ab. Ich würde den runoff messen und sicher stellen das der PH zwischen 6.2 und 6.5 liegt. Geben Sie ihr genug PK und auch CalMag. Wenn es zu einer Blockade kommt wegen dem falschen PH wert dauert es wieder einige Tage wo deine Pflanze braucht um sich zu erholen. Es sieht noch nicht so schlimm aus aber es dauert bis das was im Boden passiert bei den Blätter ankommt. Viel erfolg

Looks like a phosphorus problem to me. Try increasing your ph to 6.5, more phosphorus and potassium will become available to the plant then.