Like the color contrast with#1. They would have to be a hardy "weed" to survive on the rocks. Ellen
And under ice for four/five months too. Those rocks are a ''Stream'' that comes from the Appalachians and cross the St-Lawrence River and pop up on Orléans Island.
Sure would like to be around more often these times....
Very nice local weeds. In my dry climate if it's green, not invasive, the local critters won't eat it, and I can get way with not mowing it, it has a home.