Find out why a garden is wet before trying to drain it

Keep a rain-and-drying record

From a safe position, note where water first appears, whether it arrives from a roof, path or neighbouring slope, and how long it remains. Distinguish an isolated storm from a repeating seasonal pattern. Photograph the same view with dates; record recent paving, excavation or heavy vehicle access.

Do not dig exploratory pits where services, unstable soil or contamination may be present. Suspected leaking services, water affecting buildings or rapidly changing ground needs appropriate professional attention. A garden guide cannot determine a safe discharge route or diagnose a buried defect.

Choose the outcome that fits the cause

Moist soil that still drains: use a compatible border, such as the clay and moisture example. Red-twig dogwood is a broad shrub with some flooding tolerance, not a pump or a universal solution.

A compacted or damaged layer: investigate before assuming imported soil or a raised bed will solve it. Any displaced water still needs somewhere appropriate to go.

A persistently high water table: consider a locally suited wet-habitat garden and suitable access, or obtain drainage design advice. A dry Mediterranean palette is a mismatch. A permanently wet feature requires wetland-specific plant verification beyond a “moist” filter.

Temporary runoff storage: a rain garden is designed to receive and release water through infiltration or an approved system. It differs from a pond intended to retain water. Its siting and capacity require local rainfall, soil and overflow information.

A wet corner does not dictate the whole plot

In an illustrative 8 × 10 m garden, suppose observations mark a 2 × 3 m winter-wet corner. Map that 6 m² separately from the other 74 m². Keep the everyday route and seating on a suitable stable area while the cause is resolved. This does not prove the corner is large enough for a rain garden or that the remaining area is dry.

In the backyard plan, use a labelled observation zone before adding plants or a water feature. Keep a dated note that its boundary reflects observations, not a drainage design. Ask a specialist to review runoff near buildings, neighbours or unstable slopes.

Watch for a failed assumption after planting

Wilting, yellowing or poor growth can occur with excessive as well as insufficient water. Inspect conditions before adding more. Avoid trafficking saturated planting soil and maintain designed inlets, outlets and access according to the approved arrangement.

Revisit the water record through the wettest expected season. If standing water lasts longer or reaches new areas, pause expansion and investigate. Keep the long-term care responsibility in the brief; a planted drainage feature still needs inspection and maintenance.