Overwintering plants and plant
hardiness are not exact sciences. Your harshest winters aren’t necessarily the
years you have the worst cold damage.
Many crops can be remarkably
adaptable to cold if they’re hardened off properly. Aboveground portions of
plants have survived brief dips in liquid nitrogen – minus 320°F –
in lab experiments.
However, even the hardiest plants
can show damage if they’re subjected to cycles of high and low temperatures.
Roots are also more sensitive than aboveground growth. Roots of even the
hardiest species are killed at minus 10°F.
For nursery crops, the keys
are getting plants into dormancy, moderating temperatures through winter, and
not letting plants overheat when temperatures start to rise in late winter/early
spring.
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