Picea mariana Aurea - Black Spruce

Picea mariana 'Aurea' is a variety of black spruce that stands out for its narrow pyramidal habit and golden foliage. It produces thin branches covered with fairly short and dense needles, which become trailing over time. Its slender silhouette is accompanied by bright foliage, with short needles of a distinctly golden hue in spring, becoming more bluish but still retaining a beautiful golden reflection in winter. Slow-growing, it is perfectly suited to small gardens where it works wonders in borders or as a standalone plant. It is a low-maintenance and adaptable evergreen conifer, appreciating well-drained, moist to dry, non-calcareous soils and a sunny exposure.

Picea mariana, also known as Black Spruce or Canadian Spruce, is an evergreen conifer belonging to the Pinaceae family, native to the northeastern United States, Canada, and dominating the forests of Alaska. In its natural environment, the taiga, which is often very harsh, it grows slowly, with a habit that can vary depending on its habitat, but is usually pyramidal and dense, with a broad base. In challenging conditions, it will be bushy and compact, while in favourable conditions, it will form a slender tree. This tree can reach a height of 20m (66ft). This conifer is a symbol of the boreal forest of America, growing up to the edge of the tundra.

The 'Aurea' variety, derived from this species, is a dwarf form and particularly bright, with a compact, conical, and narrow habit. Its growth is slow. After 10 years, it will reach approximately 2m (7ft) in height and 1m (3ft) in width, sometimes more in cool and humid climates. Eventually, it can reach a height of 9m (29ft) with a base width of 3 to 4m (10 to 13ft). It produces thin branches arranged in regular spirals, which become trailing with age. They are covered with narrow, pointed, densely arranged, and aromatic (resinous smell) needles that are 6 to 12mm (0.2 to 0.5in) long. They are covered with a white wax. Its young spring shoots are distinctly golden yellow, then its foliage takes on a uniformly bluish-green colour with golden reflections. This conifer produces small cones, resembling those of larches. They measure 2 to 3.5cm (1in) in length and are purple when young, turning pale brown at maturity.

With its bright foliage, moderate growth, undemanding nature, and ease of cultivation, it is ideal for small gardens, both in borders and as a standalone plant. It thrives in many situations, as long as the soil is well-drained and free of limestone. It can be combined with prostrate (Juniperus horizontalis 'Blue Chip'), globose (Picea glauca 'Alberta Globe'), columnar, or upright dwarf conifers. Since this black spruce prefers acidic soils (even peaty ones), it can be mixed with rhododendrons, camellias, pieris, and andromedas. The structural qualities of conifers naturally stand out in the design of a contemporary garden but can also be incorporated into more traditional gardens and serve as a focal point throughout the year.