Snow Rose Dropping Leaves

My Snow Rose purchased a month ago seemed to adapt well at first.
It has looked sickly for a few weeks, leaves yellowing and this week dropping leaves precipitously. Had been watering on
a drip line/Spray system 3 minutes daily. Any suggestions at this point, I do see some minimal new growth and have cut back the watering time to 2 minutes starting tomorrow. All of the other plants on the same system are doing fine. None seem over or underwatered.

Desert rose absolutely nreds to go dry inbetween waterings. Watering every day and too little may be the cause. In late spring to mid authumI give my Roses a very big dring once a fortnight, just increase to every week during peak of summer.

My issue is with a Snow Rose not a Desert Rose. Watering every two weeks would kill the Snow Rose for sure. Any other suggestion would be appreciated. It's a beautiful plant and I paid a lot for it.

My bad. I am happy I did not misslead you.

Are you in the nortern hemisphere? Is the tree still indoors? If so I would suggest moving it outdoors now. Outdoors in summer makes a big difference.

But make sure to do the transition slowly, first in shade and then slowly adapt it to more light during a three week period.

And a picture of the tree may get better targeted suggestions about the problem.