Green Mountain Trail Professional Review and Guide
"There are several Green Mountains in the Northwest, but most hikers agree this one is greenest. The color is the first thing you may notice when you arrive at the trailhead.
As for flowers, you will be hiking through them much of the way, even later in the season when lower meadows are thick with fireweed and bracken. In midsummer, look for lupine, columbine, buttercup, bistort, bleeding hearts, glacier lilies, Sitka valerian, Indian paintbrush, cow parsnip, cinquefoil, tiger lilies, and more."