Hello- I'm new to the site and somewhat new to gardening. I have a balcony garden that is somewhat easy to maintain. But I have also just been given the responsibility of maintaining my company's indoor plants/trees. I just noticed that one of the plants/trees just developed a covering of brown "dust" on its stalks and the leaves are turning brown. The soil is also hard & crunchy, though I don't know if it was like that before. I don't know what kind of plant/tree it is- can anyone give me any insight. I've attached photos. Any help would be appreciated- thank you!