The Northern Gardener magazine is the publication of the Minnesota State Horticultural Society.    Leif has written several articles for this magazine and in the current issue – September/October 2010 his article features the use of air pruning pots and root pruning plants prior to planting.  Check out the current issue of the Northern Gardener for his article.  We are proud of this article in that the trials and testing that we have done over the last twenty years in growing plants with good root systems is proving that we are definitely heading in the right direction with this method of growing plants.