"Koi-lo" wrote:

Terra-cotta pots are a definite concern, and they're not cheap. I use those
inexpensive black plastic pots that seem to weather the cold and ice ok.

My iris are in black plastic baskets and the tubers are bursting the
baskets. I may have to cut away the plastic to separate them next
spring.
--
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18,000 gallon (17'x 47'x 2-4') lily pond garden in Zone 6
Cheers, Steve Henning in Reading, PA USA