This grower is fairly sure of this plant identification.
Box, Common box, Dudeon
Buxus sempervirens (Box). This species is grown for its dark green dense foliage. It is a good species for a formal garden but it is a slow-growing shrub; it can eventually reach a height of 5m.
It will prefer a warm climate though the roots like to be kept cool with a generous mulching. You might need to protect in the winter to keep the leaves from browning due to the cold. Should prune back hard in winter or early spring.
Ornamental, foliage, edging, border, hedging, container, banks, specimen. Year-round interest.