Is Gritty Mix or Succulent Soil Better for Cacti and Succulents? You must ensure good drainage when you are choosing the potting mix. You should keep the sprouts damp until they reach a sufficient size to be potted. Round-ball cacti, which are also known as rounded balls, can be grown outdoors or in the home for their aesthetic appeal. Your preferred room temperature should not be higher than this. You can place your cacti plants close to a window, but make sure that it does not touch the window glass. You can fill the pot with moist soil, and then press each piece into the soil.