What can you expect from rain gardens in the wet winter season?

21st May 2026

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During this time of the year, much of the UK experiences heavy rainfall. So how do rain gardens cope?

Rain gardens are designed to relieve pressure on existing traditional drainage systems that are becoming increasingly under stress as hard, impermeable surfaces dominate our cities. They capture rain water runoff from nearby surfaces, slow it down and allow it slowly infiltrate back into the ground rather than overwhelming drains and other watercourses.

Keogh Road, Newham

Cairo Place, Waltham Forest

But what happens during periods of intense and prolonged downpour?

After heavy rainfall, you may notice pools or standing water within a rain garden and question whether it is functioning as intended. But this is not a sign of failure, it is the system doing exactly what it is designed to do.

In these conditions, a rain garden is:

Temporarily holding excess surface water
Slowing the water draining back into conventional networks to prevent overflow
Allowing water to infiltrate gradually through soils and plant root systems

Over the following hours or days (depending on rainfall intensity and soil conditions), this stored water naturally dissipates as it soaks into the ground and is taken up by plants.

Rain gardens along Sutherland Road, featuring inlets and vibrant growth

At this time of year, rain gardens may appear quiet above ground and plants may not be looking their best but this is simply because it's not the right season for growth, not a sign of poor performance. However, it is resilience that is on display. Beneath the surface, soils and root systems are silently but actively managing water and helping to reduce flood risk.

As conditions become warmer, spring bulbs and new growth will begin to emerge, and the planting will come back to its full effect. In the wet winter months, managing water is the primary focus of rain gardens, leaving the visual interest to follow in the spring.

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