@LeenaY Please provide an image of the plant and pot it's in.
* How long have you had the pot?
* How deep is the pot?
* How do you determine when it's time to water?
* Do you water while you can still detect moisture in the grow medium with a finger?
* Does the pot have a drain hole?
While under-watering should remain a suspect, it's far more likely you're over-watering. If the pot is over 10" deep, and you're using your digital device (finger) to check for moisture levels, the finger can say dry while the bottom 6" (or more) of the soil column is still 100% saturated. You can determine appropriate watering intervals easily and precisely by using a wooden "tell" to tell you what moisture levels are deep in the pot where it matters most and when it's time to water. If root rot is not the overarching issue at this point, it might be what's needed to reverse the plant's decline.
If the plant was wilting while you could still readily detect moisture in the medium, you were/are over-watering. If the plant wilts and recovers soon after a good watering, you're under-watering. Another clue you might be over-watering is when a plant wilts during the day but recovers at least somewhat when the plant enters the dark cycle. The mechanism at work: Too much water causes wilting due to inability to move enough water to prevent loss of turgidity. During the dark cycle, small openings in leaves (stomata) close, which limits transpirational water loss, allowing the plant to recover some or all of its turgidity.
I also suggest you look for mites and scale infestations. Plants suffering from environmental/cultural stressors are limited in their ability to resist insect herbivory and disease pathogens.
Al
