Im not that familiar with problems on the woody sections of the plant but if its growing fine just support it and best of luck.
Its purple trainwreck so u are half right anyway. It is like the stem has rotted in that area. Was thinking of putting a bandaid on it and then a slit straw for support.
IMO it looks like you have a severe Nute problem or PH problem. Looking at how dark your leaves are the yellow tips and REALLY purple stems leads me to believe your either overnuteing and locking out alot of micros or Your PH is swinging Very badly.
Organic soil amd no nutes. Lime and crushed pyster shells in the soil so both the guesses are great but prolly not helpful cuz I no longer check ph and there should be more than enough cycled nitrogen in the mix to negate N burn. Unless 2 months is not enough time to cycle soil which doesnt seem to be bothering the other girls. This is my fault. Shoulda put in my op some info. Completely organic soil of a mix I have made before with great success. Stem is necrotic. It looks dead but its still growing strong above the necrosis. Was thinking botrytis. Not worried about the leaves. Pay attention to the stem.
