Finally, the soil is at the top of the succulent terrarium. The soil should be completely dry before watering. What are the best practices for watering Echeveria plants? Echeveria plants are best watered at the beginning of the day so that any water that gets on their leaves during the day can evaporate quickly. Remember that Echeverias can die if they are over-watered, as with other succulents. Other than plants, you might also want to add some desert-oriented items, such as stones and sand. Mix all three items together and you can make your own cactus-potting soil.