Water: Like all succulents, the Donkey's Tail doesn't require much water. Allow the soil to dry out completely between waterings. A heavy water once a month is recommended. Water less in winter.
Light: Does best with plenty of bright, indirect sunlight.
Soil: An aerated, well draining potting soil or cactus mix is best.
Humidity: Succulents don't fair too well with higher humidity or excess moisture. Keep in a relatively dry place.
Fertilizer: Use a balanced, diluted houseplant or cactus fertilizer once a month during growing season. Do not fertilize in winter.
NOTE: These plants are very delicate, and have a propensity towards dropping leaves whenever it's disturbed. Due to its delicate nature, there is a high chance that some leaves may drop, or stems may break during transport. Should this happen, you can either discard the dropped leaves, or leave them sitting on top of soil, or a paper towel, to allow their ends to "heal over" (something which takes 1-5 days depending on temperature). Once healed, you can place the ends of the leaves/stems into potting mix, and they should begin to grow on their own.