Why Is My Rhubarb Struggling After a Wet Winter or Spring?

Rhubarb crowns that sit in saturated soil through a wet winter or prolonged spring wet period are under serious stress. Waterlogging deprives roots of oxygen, killing the fine feeder roots and opening the crown to rot pathogens. The effects often appear in spring as the plant tries to put on growth — struggling, slow emergence, yellowing leaves, wilting despite wet soil, or in the worst cases crown rot. Addressing the drainage problem, rather than the plant's symptoms, is the only effective response.

Testing your soil drainage

The simplest drainage test is to dig a hole 30cm deep when the soil is at field capacity (after rain but before it has dried significantly). Fill the hole with water. If water is still present after 30 minutes, drainage is inadequate for rhubarb. If it drains within 10 minutes, drainage is likely adequate. Soils that hold water for several hours or days are unsuitable for rhubarb without significant modification.

Options for improving drainage

For moderately slow-draining soils: incorporate coarse grit and organic matter to improve soil structure, and plant on a slight ridge 10–15cm above the surrounding level. For chronically waterlogged sites: construct a proper raised bed at least 25cm above the surrounding level, filling it with a loam and grit mix. Diverting surface water away from the bed area using swales or surface shaping also reduces the volume of water reaching the root zone.

When to replant after waterlogging damage

If a crown has been damaged by waterlogging, improve drainage before replanting in the same site. Allow the site to dry properly through summer before autumn replanting. If crown rot is established, remove all affected material and do not replant in the same spot for at least one year while drainage improvements take effect.