Ive read of a couple of reasons why leaves turn yellow, can someone point me in the right direction as to what might be my issue?

This occurred on only one of my 3 plants which are now 3 weeks into flowering, this is close to the main kola.

Should I just leave it be or should i trim it off?

Thanks for the help!
m4o2n0a Reviewed by m4o2n0a on . Magnesium? Overwatering? Nutes? Help! Ive read of a couple of reasons why leaves turn yellow, can someone point me in the right direction as to what might be my issue? This occurred on only one of my 3 plants which are now 3 weeks into flowering, this is close to the main kola. Should I just leave it be or should i trim it off? Thanks for the help! Rating: 5