Find the Blessed Knoll and ask a forest guardian for help. It's marked on your map, the loc is 422, 34, 757 .
You can fly, but will occasionally get cursed and be grounded until the curse wears off, and there is some agro. The path is safe for the very cautious.
Get three off the blessed plants. They're called "Tunarean trumpeteaf" and are in the immediate area. You can track them with Track Resources.
Return to the mariner at the dock. NOTE Escape and Evac take you to North Dshinn, not the Wanderer's Dock!