In forest regeneration, natural regeneration is always
favored when it is likely to result in a good seedling stand in
a reasonable time. Natural regeneration of pine has given
good results especially on the driest sites. Due to the thick
humus layer natural regeneration of spruce, seldom gives
sufficiently new seedlings. In artificial regeneration, only
native tree species are used (Hyva ¨n metsa ¨nhoidon suositukset, 2001). In Finland the newly established stands by
planting are mainly combinations of planted and naturally
regenerated trees. This mixture of local genetic material
with imported new genetic origin by planting or seeding
increases the genetic diversity within the stand.