Euphorbia glauca, commonly known as waiuatua or shore spurge, is a perennial herb endemic to the coastal regions of New Zealand. It is characterized by multiple erect reddish stems that can reach around 3 feet in height and bear blue-green foliage. The plant is notable for its long flowering season, from September to March, with sporadic flowering possible at other times. The inflorescences are located at the stem tips and are surrounded by distinctive deep red bracts that resemble cups. Following the flowering period, the fruit is produced from December to May. In its native habitat, Euphorbia glauca is typically found on coastal cliffs, sand dunes, and rocky lake shore scarps, where it contributes to the stabilization of these fragile ecosystems.

Euphorbia glauca is valued for its unique foliage and flower color, which can add interest to coastal gardens and restoration projects. It is also used in rock gardens and as a specimen plant in sunny, well-drained areas. The plant prefers full sun exposure and thrives in sandy, well-drained soils. While it is relatively easy to propagate from seed, cuttings, or division, it does face several threats in the wild, including browsing by animals, habitat destruction from road widening, and susceptibility to fungal diseases. Gardeners should be aware of its conservation status and take care not to contribute to its decline.CC BY-SA 4.0