James,
As a pecan grower and former nurseryman, I can understand your concern. All plants can experience freezing of the roots in plastic pots during periods of extreme cold in Winter. Some plants are tougher than others---and I would say that pecan roots would be among the tougher group. I have lost deciduous plants in pots from cold weather before.
All you can do is wait and see. I would lean toward the pecan trees surviving. The tops will of course be very much alive at this time. If there is extreme root damage, it should show up soon after the trees bud out in Spring. No live roots will cause the growth to halt, wither and die. However, if there is only some damage to feeder roots, the trees will grow more feeder roots in time.
In most cases, you should expect to know the extent of any root damge by mid to late Summer.
Regards,
Richard, NW FL
--- On Wed, 2/17/10, James Geoffrey Steen <geoff_steen@yahoo.com> wrote:
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