Every year we plant 15.000 trees from 8-10 to 14-16 containers: from avenue trees to form trees and multi-stemmed trees. If the trees are mature, they have sizes from 10-12 to 25-30. Benefits of trees in containers are that there is no soil diseases and that they can be planted all year round, also in late spring and summer. We use container bags of 50 and 70 liters for growing the trees. The main advantage of a bag compared with a hard-pot is that the trees less damage during transport. We leave the trees up to two years in the same bag, to prevent the wrong type of roots.