Finland is one of the best areas in the world for tree growth. It belongs to the cold climatic belt in which sub-zero winters alternate with warm summers. The summer season lasts only 100 days, during which the trees grow. The short growing season means slow growth, which may last 60-120 years.
The slow growth provides the best possible straight-grained timber: branches are few, and those that exist are small. Growth is symmetrical and trunks are straight and round. Growth rings are thin and tightly-packed. The amount of juvenile wood is small and heartwood great. The result is a hard, tough and straight-grained timber with low tension and few internal cracks. The low-resinous, evenly patterned Finnish wood is first-class material for many purposes.