Something is seriously wrong.

I have helped a friend correct this quite easily, it just takes a bit of time. Here is a nice article and shows almost the same as what is going on with your plant. https://www.growweedeasy.com/cannabis-plant-problems/iron-deficiency As said before, you can use compost and compost teas to fix the pH and you can add some epsom salt or whatever you use for cal mag to help it green up, but just the compost will help her. You won't fix it in 1 go, but you should see her get more colour in those tips slowly. Within 3 to 4 weeks my friends plant went from looking worse than this to not being able to see anything wrong.

Looks like iron deficiency with a few other things mixed in, probably not caused by lack of iron, more likely pH is off and stopping the uptake. Humic and fulvic acids can neutralise pH and compost is full of humic and fulvic acids, so a top dress of compost or compost tea should sort you out.

If its just tops, you loaded something heavily acidic i would say. If happens branch after branch, then maybe Fusarium Wilt (Fusarium oxysporum).

Something is wrong in the roots, likely fed it weird or PH got off. To much N should make them dark hunter green. not burn white and die. Also maybe something damaged it. I would avoid washing the plant with milk... If anything give it a nice long water and try to dilute the damage from before. NO ph adjustments.

heavily overfed, u gave too much in 1 go so u've burnt the roots that 'll be a lesson for u Don't give more then 3g salt per liter

Leaves look mostly healthy in color and shape. Some lighter color visible but no major leaf necrosis or big deficiencies showing on fan leaves. Flower tops: -New growth at bud tips appears yellow, white, or bleached → not normal for healthy pre-flowers. -Some areas show crispy, burnt tips and edges on the flowers themselves. -Rest of the plant looks fairly healthy → localized damage. Soil looks reasonably aerated; no visible overwatering signs. From everything you’ve shared, the biggest suspect is heat and light stress from intense afternoon sun Flowers are bleaching or burning → classic sign of excessive UV and infrared exposure. Cannabis pre-flowers are delicate and sensitive to: -Intense sunlight -High temperatures -Sudden environmental swings Nutrient Deficiency? Less likely because: -Fan leaves look fine overall. -Nitrogen alone won’t solve flower tip bleaching. -Damage is localized to the tops exposed to intense light. Bleaching happens when: -Chlorophyll and pigments break down under too much UV. -Bud tissue loses color → turns white, pale, then crispy. Watering Habits? -Dry soil in high heat can amplify light stress because plants can’t cool themselves properly. -Ensure watering is adequate, especially on hot days. What To Do Next -Install a shade cloth (30–50% shading) for the west side during peak sun (1 pm – 5 pm). -Even a temporary barrier like garden mesh or a sheet will help protect delicate flower tips. -Water thoroughly in the morning. - Avoid Heavy Feeding for Now -You’ve already added nitrogen. -Excess feeding during stress can make things worse. -Focus on gentle balanced feeding (including P and K) as flowering progresses.Helps the plant stay hydrated to handle heat stress ✅ Can This Recover? →Yes—but damage already done to flower tips won’t “green back up.” -The plant will continue pushing new growth. -If you prevent further sun burn, new flowers should develop normally. for people who might say its bud rot → No. This doesn’t look like bud rot: -No mushy gray mold -No browning from inside out -No foul smell -This is physical sun/heat damage, not fungal disease.

You have some sort of bugs or rot issues. I Say tu cut the infested branches of and then give your plant a Good wash with water and milk