Pussy Willows grow best when near lots of water. So those in Delta Ponds thrive! I find the shoots of the pussy willow tree to be beautiful.

"Growing Requirements for Pussy Willow Trees
Pussy Willows are hardy in USDA zones 4-8.
They grow well in almost any soil but it is a good idea to supplement the native soil
with peat moss, leaf mold or compost.
Pussy Willows require full sun to thrive,
but they will survive in light or partial shade as well.
As with most species of Willow, they grow best when given lots of water."
From: http://www.thegardenhelper.com/pussywillow.html