Can anyone help me, one of my leaves has developed a brownish/redish spotting on it what does this mean? Any help will be apriciated seeing as I am a complete newbie with this.
I believe this is Magnesium Deficiency..
You'll see some interveinal yellowing and irregular rust brown spots on older and middle growth. I had the same issue and some epsom salts took care of it pretty quick. Cal-mag should help if you dont have a direct source of mag like epsom salts