By Vallens
Canada 
I have a variety of Salix that is a perennial with small pale blue astor type flowerheads in spring and yellow leaves in the fall. It's about 45cms or 4.5ft tall. I don't believe that it's a cultivar. Could you give me the variety name, ideal growth conditions and its spread at maturity.
PS - it's NOT a bush or tree
25 Aug, 2013
Answers
Moongrower - thanks so much. Meanwhile I've discovered that is blue star willow which as you correctly surmised is not a Salix but Amsonia tabernaemontana .
My information came from the master gardeners at the Royal Botanical Gardens just west of Toronto.
grow@rbg.ca
25 Aug, 2013
I,d love to see a photo too, it sounds beautiful
26 Aug, 2013
It is a lovely plant and available in Britain, we have it in the garden.......................somewhere!
26 Aug, 2013
The only Salix I am aware of are shrubs and trees - could you add a photo to your question?
25 Aug, 2013