Carnations
My father kept up that tradition through the '50s, except that our carnations were red, not pink.
I believe there is a British tradition called "Mothering Sunday,", which I will leave to a Brit to expound on. But it seems to have spread to the colonies. Our church has a large number of members who are Nigerian, of the Igbo tribe, and they celebrate Mothering Sunday in late May, so on that Sunday, the usual procession is headed by the Igbo women, all dressed in their finest ethnic costumes, which are very colorful indeed, who come down the aisle singing and dancing to a native song. The service is followed by a festival meal, mostly African, in the undercroft, to which the entire congregation is invited, and nearly everyone attends, as the food is marvelous, and a great time is had by all, black, white, Hispanic and Asian (we have a very diverse congregation).