The instinct when faced with a persistently wet area of garden is to try and fix the drainage, and in some situations that is the right approach. But in many Irish gardens, particularly those on low-lying ground, beside streams, in river catchments or on heavy clay that simply does not drain freely regardless of what you add to it, trying to engineer your way out of the problem is expensive, disruptive and often only partially successful. The better question is which trees will actually work with the conditions you have rather than against them. There are more answers to that question than most people realise, and some of them are genuinely beautiful.

The first and most important distinction to make before choosing any tree for a wet site is whether you are dealing with ground that is permanently waterlogged or ground that floods and becomes very wet in winter but drains down and dries out through the summer. These are different conditions and they call for different plants. Permanently waterlogged soil, where water sits at or near the surface for most of the year, rules out a much wider range of species than ground that is simply very wet from October to March. Most trees, even robust ones, cannot tolerate having their roots starved of oxygen for extended periods. The ones that can are a specific group and it is worth knowing which they are before spending money on the wrong plant.

For ground that is genuinely and consistently wet, alder is the tree I would reach for first. It is our most reliable native tree for wet conditions, naturally found along riverbanks and the margins of lakes right across Ireland, and it performs in waterlogged soil that would finish off almost anything else. It is not a showy tree in the ornamental sense but it has real presence, grows strongly, supports an enormous range of wildlife, and fixes nitrogen in the soil through its root system in the same way that legumes do, which actually improves the ground around it over time. If you have a wet field corner, a stream margin, or a persistently boggy area of any size, alder is the answer. Native willow works on the same principle and is equally at home in the wettest ground. The image at the top of this page shows a weeping willow beside a lake, and that image captures exactly the right relationship between tree and conditions. A weeping willow in that setting is not just surviving, it is in its element. It is one of the most dramatic and graceful trees you can plant in a large, wet Irish garden, and given enough space it will become a genuinely spectacular feature.

Poplar is another tree that handles consistently wet conditions well and has the added benefit of growing extremely quickly, which matters when you are trying to dry out a large area or establish structure in what is currently an unusable corner of the garden. The caveat with poplar, and with willow, is space. Both have extensive, vigorous root systems that will seek out moisture wherever they can find it, which means they should be kept well away from buildings, boundary walls, drains and underground pipes. On an open site with room to grow, they are excellent. In a confined suburban garden they are not the right choice, regardless of how wet the ground is. If space is limited, alder gives you the wetland tolerance without the same aggressive rooting habit.

Dogwood, or Cornus, is worth considering where the ground is wet but not quite at the permanently waterlogged end of the spectrum. Many of the Cornus species and varieties will perform well in consistently damp soil and they bring something that alder and willow do not, which is ornamental interest through multiple seasons. The coloured stem varieties in particular are striking through the winter months when the garden has very little else to offer. They are shrubby in habit rather than forming a single canopy tree, which makes them more useful in smaller spaces or as an understorey layer beneath larger trees. Birch is another strong choice for the seasonally wet end of the scale. It will not tolerate constant waterlogging the way alder will, but in ground that floods over winter and drains through summer it is genuinely excellent, and it is one of the most beautiful native trees we have. The white stem, the delicate canopy, the autumn colour — birch earns its place in any Irish garden where the conditions suit it.

Whatever you plant, do not expect it to work like a drain from the day it goes in. A young tree has a small root system and its capacity to draw moisture from the surrounding soil is limited until it establishes. It is only as the tree matures and the root system extends that you will notice a meaningful difference in how wet the surrounding ground remains. Plant with a long-term view, give young trees the best possible start with well-structured soil around the root zone to support early establishment, and be patient. A wet corner of the garden that is planted with the right trees is not a problem to be solved. It is a habitat in the making, and in five or ten years it will be one of the most interesting and wildlife-rich parts of your entire garden. If the wet area is part of a broader planting question involving structure, screening or the overall layout of a difficult site, choosing the right plant for the right place is always the starting point, and that principle applies as much to a boggy corner as it does to any other part of the garden. For new build gardens in particular, where topsoil has often been removed or compacted and drainage is compromised from the outset, thinking carefully about what you plant and where before spending money on plants will save a great deal of frustration.