Ruellia humilis

Hello Per-List:

I have a newly acquired plant - Ruellia humilis.  I have thought this genus 
tender in northern states.   At the arboretum sale where puchased, I was told 
this species is hardy through zone 4.

Now, I am having trouble believing the zone 4 information.  I put my plant in 
a cold frame for the winter.  Is there any experience out there with r. 
humilis or any ruellia hardy in the north.  There has been some discussion on 
the Shadegarden List regarding this genus but I was told: full sun. 

Ruellia does not seem popular enough to appear in catalogs or books in any 
depth.

BTW, winter is a thought here. We had a light frost on September 5.  Now the 
rains are back.  What a summer!

Claire Peplowski
NYS z4

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