It looks like a deficiency of some nutrient. Try some fertilizer that is a complete fertilizer not just an N-P-K fertilizer. Only use the fertilizer at half strength of what is shown on the fertilizer chart.
gronnh20 Reviewed by gronnh20 on . i need some help with my plant i need serious help with my month and a half old. it has started these brown spots on third node leaves. i need to know if it something serious i need to worry about. i havent added any ferts. i tested my soil last night with some aquarium test strips . it said that my soil has hard water and that it has a very high nitrate level. if you need more info please ask . help me if you can Rating: 5