millworkman said:Epsom Salt.
AlabamaJack said:I would just throw about a tablespoon on top of the dirt next to the plant and water it in...you should see greening up in two-four days
RichardK said:if it's not a Magnesium problem it might be low Nitrogen, if you have not fed them in a week or two with fertilizer, do so now.
Also if you can, check the soil pH, it should be around 6.5 to 6.8... If it's too high (Alkaline) add some vinegar and water (Tablespoon per gallon) if it's too low (Acidic) add some Lime like dolomite.
Good luck!
Minion §1 said:its 15-30-15