💧 Watering & Drainage
Water needed by plant type, pot size and climate
About this calculator
The Watering and Drainage calculator matches water delivery to what soil can absorb. Enter soil type, bed area, and emitter or rainfall rate; it estimates how long to water to reach the root zone without runoff, and how quickly the soil drains. Sandy soils need short frequent cycles; clay needs slow deep ones.
Tip: water in the morning — leaves dry by evening, which cuts fungal disease far more effectively than any spray, and less water evaporates before reaching roots.