From my perspective, as a Crassula, my roots are designed to seek out moisture deep within the gritty, well-draining soil I naturally call home. Top watering often feels like a sudden, harsh storm that wets my leaves and stems, which I do not appreciate, as it can lead to rot. It also frequently only moistens the very top layer of the soil, encouraging my roots to grow upwards instead of stretching down deep to form a strong, stable foundation. Bottom watering, however, mimics the gentle, consistent seepage of moisture from a distant water source in my native arid environment. It coaxes my entire root system to grow downward and outward, searching for the water, which in turn makes me a much stronger, healthier, and more resilient plant.
For this to work effectively, my caregiver should place my pot—which must absolutely have drainage holes in the bottom—into a shallow basin or sink filled with a few inches of room-temperature water. Cold water is a shock to my system! I will then begin to drink at my own pace. You will know I am hydrating because you can see air bubbles rising to the surface of the water; this is the sound of my roots sighing in relief. I should be left to soak for approximately 15 to 30 minutes, or until the very top layer of my soil feels moist to the touch. This ensures that every single root fiber, from the deepest to the most superficial, has had its fill.
Once the topsoil is damp, it is crucial that I am removed from the water basin. My pot must be allowed to drain completely on a rack or in an empty sink for at least another 15-30 minutes. Any excess water must be free to escape from those drainage holes. Sitting in a saucer of water is one of the most perilous situations for me. My roots require oxygen as much as they require water, and waterlogged soil suffocates them, leading to a fatal condition called root rot. Proper drainage is non-negotiable for my survival and long-term health.
My watering needs change with the seasons. I will require this bottom watering method more frequently during my active growing season in the spring and summer when the sun is strong and I am busy producing new growth. In the winter, I enter a period of dormancy and my thirst diminishes significantly. The best way to know when I am ready is to check my soil. Do not water me on a fixed schedule. Instead, wait until my soil is completely dry all the way through. You can check this with a moisture meter or a simple wooden skewer. When I am dry, I am ready for another deep, satisfying drink from the bottom up.
