Resistance to frost

Hi everyone:
 
We have had frost several nights, enough to wipe out the impatiens and tomatoes and yesterday an inch of snow.
 
It's gone this morning and the geraniums and shrimp plants (Justica) are sitting up in the border as perky as ever.  The Shrimp plants are full of bloom.  They seem to like the cooler weather.  I had no idea they were so hardy. 
 
Do you all put your extra houseplants in the flower beds in the summer?
 
Ruth  Z
email: r*@execulink.com
Freelance writer and gardening consultant zone 5/6  southern Ontario
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