Lately I have found out that my N. dubia is loosing leaves(They first become black).
But the plant itself is still growing.
I cultivate N. dubia under a 800 W lamp. The photoperiod is about 10-12 hours. The daytime temperature is about 25 C(70-80F), and the night temp. around 15-20 C(55-65F).
The humidity level never goes below 70 %.
So could you please tell me what's going on?