I am in the middle of repotting pines, most haven 't been repotted for at least 6 years, one 9 years. Funny thing is, despite the warnings of the turface crowd, the Akadama is in good shape.... And thse trees spent years in rapid, repeated , freeze-thaw cycles in NW Arkansas and here in the Connecticut deep freeze. Boon and I repotted for a week, I have another 20 or so older pines to do, then about 100 from Colanders to bigger colanders.