impossible to say without more info. but if you want me to gues it looked over feed. either that or some cind of deficiency.
if you havent used nuts its probably deficiancy since all nuts in the soil is used up over 2-4 weeks (depending on soil). in that case start giving nuts or you can repot it into new soil and it should balance the values.
if you are giving it nutes alrdy i would say you nuteburned it and its suffering from nutelock.