Rethinking Garden Plantings: Native Species vs. Drought-Tolerant Exotics

Richard Eltringham (Letters, 5 August) contends that a warming climate makes it necessary to replace many garden and park plantings with drought-tolerant non-native species. He argues that such a shift would help landscapes endure hotter, drier summers. This proposal has been met with criticism from horticultural and ecological experts who warn that abandoning native planting could undermine broader ecosystem functions.

The Guardian

Native oaks, for example, provide habitat and food for roughly 2,300 other species, a network of interactions that non-native plants do not fully replicate. While some native trees are showing rapid micro-evolutionary changes that improve drought resilience, the overall ecological role of native flora—especially as food plants for insect larvae—remains difficult to replace. Moreover, Mediterranean-type gardens that rely heavily on drought-adapted exotics often appear brown in summer, yet those same species may suffer in the United Kingdom’s cool, wet winters.

The Guardian

Martin Sullivan, professor of global change ecology at Manchester Metropolitan University, describes Eltringham’s suggestion as “puzzling,” emphasizing that many native plants already possess drought tolerance and that a wholesale move toward exotics could erode progress toward wildlife-friendly gardening. Lorraine Du Feu, a resident of Cheltenham, Gloucestershire, echoes this concern, noting that the majority of garden plants are already exotic, but that native species continue to support insects throughout their life cycles, not just adult pollinators. Both experts argue that adaptation should not be equated with abandoning native planting initiatives.

The Guardian

The debate highlights a tension between short-term climate resilience and long-term biodiversity preservation. While drought-tolerant exotics may offer immediate visual relief during heatwaves, reliance on them could diminish habitat quality for a wide range of native insects and birds. Maintaining a diverse palette of native, drought-adapted species appears to balance climate adaptation with the need to sustain complex ecological relationships.

The Guardian