Frost Damaged Terracotta Pots

I've had a pair of these beauties for years, filled with standard roses (which I loathe).  Last autumn mid-prune, I finally became so incensed with the rampant blackspot I reached down and hacked the stem in half.  Then reached over to it's twin and decapitated that one, too.  The sense of relief was wonderful; at last the bloody things were gone.  I burned the roses, emptied out both pots and gave them a good scrubbing with bleached water, then left them standing empty over the winter.  I think this year the prolonged snow and freezing temperatures overwhelmed them, and my beloved "bee hive" pots are ruined.  Maybe it was only the contents holding them together.