Abies sibirica aka Siberian Fir

Abies sibirica is a large evergreen tree, typically reaching 30 to 35 metres tall with a trunk 0.5 to 1 metre in diameter and a narrow conical crown. The American Conifer Society classifies it in the "Large" growth category, exceeding 12 inches per year and surpassing 12 feet within 10 years, though growth slows in dense shade. The tallest cultivated specimen on record reached 40.5 metres in Finland.

Siberian fir is very shade-tolerant, especially when young, and naturally grows in the understorey of dense boreal forests. It will also accept full sun in cool climates, but growth slows noticeably in deep shade.

This is one of the hardiest conifers in cultivation, surviving temperatures below -45.6°C (-50°C / -58°F) and rated to UK Zone 1. It thrives in cool, moist boreal climates and tends to underperform in milder regions; spring frost can damage early new growth.

Siberian fir is evergreen and requires no seasonal leaf management. In its native range it experiences extreme winter cold (down to −50°C) and recovers fully each spring. No special winter protection is needed in suitable hardiness zone 1–5 climates.

The soft, flattened needles of Abies sibirica are strongly aromatic, and essential oils distilled from the foliage are used in aromatherapy, perfumery, and cosmetics as masking and perfuming agents.

As a conifer, Abies sibirica does not produce true flowers. Instead it bears cylindrical seed cones 5 to 9.5 centimetres long that ripen from bluish to brown or dark brown in mid-autumn, following pollination in May.

Two subspecies are recognised: subsp. sibirica, which spans the species' enormous native range from European Russia through Siberia to the Russian Far East and northern China, and subsp. semenovii, restricted to the mountains of Central Asia. At least 17 named cultivars exist for ornamental use.

Plant young trees 30–90 cm tall in moist, mildly acidic soil in a cool climate; the species tolerates light sandy through heavy clay soils but dislikes waterlogging and atmospheric pollution. It is best suited to cold-temperate and boreal regions and frequently underperforms where summers are warm.

Propagation is primarily by seed sown in late winter or early spring (February under glass or March outdoors); stratification produces more even germination, which takes 6–8 weeks, and seed remains viable for about 5 years. Lower branches will also root naturally where they touch the ground.

Wood decay and rot are the dominant problems for Abies sibirica, generally limiting its lifespan to 150–200 years. The fungus Delphinella balsameae causes shoot blight on the species, and late frost injury and air-pollution damage have also been reported.

Trees are monoecious and wind-pollinated, with pollen released in May and seeds ripening from October to November.

No edible parts are known for Abies sibirica; PFAF rates its edibility 0 of 5.

Essential oil distilled from the leaves is reported to have antirheumatic, expectorant, and stimulant properties, and yields Siberian Pine Oil that has been used as a rubefacient. PFAF gives the species a modest medicinal rating of 1 of 5.

The light, soft, not very durable wood is used for light-frame construction, poles, pilings, furniture, and pulp. Aromatic essential oil from the foliage is used in aromatherapy, perfumery, cosmetics, and tonics, and the tree is also grown as a Christmas tree and ornamental, with at least 17 named cultivars in circulation.