I usually wait until I see signs of growth and start a light watering program, which increases a little as the season progresses. My tylecodons are starting to push leaves now as are my boojums. Last year I watered once a week through the winter and spring and they seemed to like that. All these plants are outside and have been getting the rain we have had, so perhaps they are a little early and perhaps watering does spur growth. Im not sure but I typically stick with what has worked for me in the past.