Thank you
@sallyg and
@plantladylin. Your comments are very helpful. There are only two people in the office and we water once a week or so.
Do you suggest anyways to know whether we are over watering?
The lighting is good. We have floor to ceiling windows. There are blinds on the windows, but we rotate them open to allow for maximum lighting.
I am wondering, can it be the air in the office (we have been in the office for around 7 months and this happened to over 6 plants of different types). My other question, would using filtered water versus tap water help?
Thank you a lot for your help.