it could be that too, you gotta start narrowing it down some how. On second thoughts if you dont find a ph meter i would see what a couple 1/2 strength waterings does to it, the new growth is pretty "starved" looking
1) An obsolete bit of slang.
2) A deficiency.
cheers 'neer
The hurt tips/edges suggest overnutrition (nute burn) and yet the discolored patches suggest a nutrient deficiency. This pattern usually bespeaks some sort of lockout - excess of one ion is hindering uptake of another, leading to deficiency in "another".