Q.Why Is My Citronella Plant ? Like This?
Hi. As recommended, I kept the soil at an acceptable moist level. Only some of the bottom leaves are affected. In the area where I stay, it has been raining the past few days. Could it be the weather? Also, when I touched the leaves (in general), it feels dry. Do advise me on what I can do as I am new to gardening. Your reply would meant a lot! Regards, Murphy

Certified GKH Gardening Expert
This looks to be the start of nutrient deficiencies! There are a few ways to correct this, but the best way will be to put it into a slightly larger container with fresh soil. This will give the plant room to mature further, and give it a boost of fresh nutrients.
These articles will help:
https://www.gardeningknowhow.com/houseplants/hpgen/learn-more-about-repotting-houseplants.htm