Green Spiral (Firma) 2020 EU Silv Fir Interm Grn HW8Fx4F Abies Alba 
A full-bodied, semi-pendulous conifer with glossy, rich green needles. Main leader wanders sideways providing a vertical visual interest and the reason for its name. Prefers sun in well-drained soil. 8' tall x 4' wide in 10 years. Hardy to -20 degrees. USDA zone 4-8. Grafted on Abies Firma Root Stock resulting in improved Heat Tolerance in USDA Zones 7 and Higher. Annual Vertical Growth Rate: 12 Inches per year
 
American Conifer Society Attributes:
Abies alba 'Green Spiral' / Green Spiral European silver fir
RECOMMENDED HARDINESS ZONES:6 (0 to -10 F / -17.8 to -23.3 C)9 (20 to 30 F / -1.1 to -6.7 C)
HORTICULTURAL STATUS: EstablishedORIGIN: Garden OriginCOLOR: Medium Green TRINOMIAL TYPE: CultivarGROWTH SHAPE: Upright WeepingGROWTH SIZE: Large: greater than 12 inches (30 cm) per year / greater than 12 feet (4 m) after 10 years
 
Abies alba 'Green Spiral' is an upright weeping form of European silver fir with a strong central leader, with the branches spirally descending around it, with the lateral branches and stems pointing downward in short curves. Needles are short and dense.
[ Arthur Lee Jacobson in North American Landscape Trees ] 'Green Spiral' is a twisted, narrowly pendulous, semi-dwarf, 30-feet (9 m) tall, cone-less tree, that is propagated by specialist nurseries.
 
Origin:
This cultivar is an old clone, but was only named in 1979 by Sir Humphrey Welch. The original specimen was received by Secrest Arboretum of Wooster, Ohio in 1916 as a 1 foot (30 cm) tall grafted plant from Biltmore Nursery of Asheville, North Carolina, under the name 'Tortuosa' (which is a proper dwarf).
(Jacobson, 1996)