Could be calcium def.
Adding calcium is good practice anyway.
stinkyattic Reviewed by stinkyattic on . Need some urgent help hey guys, i just got the cam working so heres some pics of the thing, well the black plague i like to call it. Basically the leaves are blackening at the tops and are beginning to shrivel up and turn kinda crispy like, some leaves are also just patchy (w/ black patches) but i have no idea what the problem is. Im using weak ferts, bigfoot veg a and b (there like 2.5, 0.5, 1.5)and(1.5, 0, 2) something like that i can check but i use it roughly every 1-1.5 weeks and its sometimes recommended every Rating: 5