i have a potted indoor goji plant in very well drained soil with 1/4 sand and 3/4 peat moss and some worm castings. this plant stays indoors and recieves adiquate light all day.i make sure that i let the soil mostly dry out between waterings. i noticed today that only the new growth on some of the stems is wilting even though i just watered it yesterday. i had this problem on this plant in the past so i decided to cut the wilted tops of the plant off. now new tops are getting wilted. i sent some old pictures of the plant when it was wilting only on the top stem and the new pictures when i cut the stem off and when the other healthy growth started to wilt. first four pictures are old, and the last three are new. what is going on? could it be root rot?