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The young populations of Norway spruce ( Picea abies ) can be evaluated in terms of both variability in the quantitative characteristics and share of different phenotypes according to the needle types. A set of two-years-old seedlings produced in the nursery and several populations of natural regeneration in the Krkonose Mts. and the Krusne hory Mts. were evaluated using the needle anatomy, size and colour. The tree height growth was measured simultaneously. The growth was related to some needle features. Four basic anatomical types of needles were distinguished in the mountain Norway spruce seedlings: flat needles, intermediate needles, inversion type and sclerotized needles. The growth of natural regeneration populations is mainly correlated with the needle width and the length/width ratio. The population variability according to growth can be related to the variability of some phenotype characteristics. This relationship differs in natural regeneration and planting.

Phenotype features in juvenile populations of Picea abies and their growth