self-seeding spruce undergrowth

advance afforestation aftergrowth ancient arboriculture breed breeding conifer coniferous dune fir firtree forest forestry growing growth husbandry management natural northern open reafforestation recovery regrowth restoration revegetation sand sandy science second sector seedling seedlings selfseeding selfsown silviculture small softwood soil species spruce stretch sylvics sylviculture taiga tree trees undergrowth wood young