By Vallens
Canada 
to moongrower
Thanks for your time. Meanwhile I've finally tracked my plant down - Willow blue star which is absolutely not a Salix at all but Amsonia tabernaemontana.
I contacted the master gardeners at the Royal Botanical Gardens just west of Toronto.
grow@rbg.ca
25 Aug, 2013
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Good to know they could help.
26 Aug, 2013