yellowing leaves started at the base of the plant
The first appearance of yellowing leaves happened at the base of the plant, and then gradually yellowing its way up. 2/3 of leaves are all yellowed and have brown tips or edges. The very top 1/3 is still green. Thus, it is more likely a pest problem, for it's gradual progression. I did not see any insects on the plant though.
Can anybody suggest anything? Thanks