Phlox subulata 'Emerald Cushion Blue'

Perennial of the Polemoniaceae family, this cultivar of Phlox subulata shares the North American origin of the species, naturally established on rocky outcrops and dry slopes of the eastern United States. 'Emerald Cushion Blue' is one of the most widespread cultivars in the lavender-blue range of the species.

It forms a dense and well-structured cushion, 8 to 12 cm in height when in bloom, with a slightly domed and regular habit. The persistent linear-subulate leaves, medium to bright green, are tight and prickly. A notable detail, observable outside of flowering, is the winter coloration of the foliage, which turns yellow-orange to bronze under the effect of cold, before greening again in spring.

The flowers, produced in great abundance and completely covering the foliage, are a pale bluish lilac, almost lavender, with a small discreet dark red central eye. The hue, soft and lightly saturated, varies slightly depending on sunlight, oscillating between light lilac and a lavender-blue perceptible in full light. It is one of the closest shades to blue available in the cultivars of Phlox subulata.

In its natural habitat, the species' flowering extends from April to June. In cultivation, 'Emerald Cushion Blue' generally blooms in April-May. It requires full sun, well-drained soil, and does not tolerate stagnant moisture in winter.