Is Gritty Mix or Succulent Soil Better for Cacti and Succulents? Good drainage is one thing you should give priority when it comes to the potting mix you choose. When the sprouts are large enough to be able to be potting, keep them moist. In general, rounded ball cacti are grown mainly for their aesthetic appeal - in the gardens (in places where they can survive outdoors) or in the house. If your preferred room is warmer than the recommended temperature, position your cacti plants near a window but ensure it is not touching the window glasses.