This plant should probably be put out of its misery but in deference to the strain, Jack Herer, I'm going to let it finish.
The few grams I get out of it better be incredible. The buds are forming and it's a fairly low maintenance plant. Just really small.
Looks like calcium to me. Possibly potassium but that usually wont show until flowering. Hard to tell with the current state. But week 4 shows the start of the issue a lot better