this look like calcium def to anyone? what would you guess this problem is (ASIDE FROM PH) its just been getting regular MG veg feedings like ive always used. and same soil ive been on for years.
If this plant is veg, and that is a bottom leaf...then Id say its a combo K/Mg deficiency issue with a dash of N. Dump some 3-1-2 plus some epsom salt. If the leaf is towards the middle of the canopy....P/K mostly P deficient Too much N could cause these problems, but there would be a substantial amount of leaf curl and stem elongation