I've had my string of pearls for a month now. I've been wanting one for so long! I don't know what I'm doing wrong as I don't know why my stems are brown and dry looking. I live in a south facing home and I have it about 10 feet away from the south facing window. I try not to water it much as I'm worried about over watering. I don't know what I'm doing wrong, can someone help me please?