I've had my Desert rose for a couple of years now. This past winter I brought it inside to avoid cold temps, and dropped the watering to about once a month. (not all at once, but gradually through the fall). I was told it would go dormant and very little water was needed. It lost all of its foliage. Now the warmer weather is back and its again outside and gets watered when it rains. After about 3 weeks it still hasn't grown any foliage at all. The trunk and branches are firm and green. Is something wrong? or is it just taking its sweet time with waking up?