I do not know how the three in the corner of our garden got there but they have bloomed the four springs we've lived in the house so I can only assume they've been here for at least eleven years. This is the first year they have been so predominant and I only wish there were more of them. Maybe if those ants get busy the new owners will end up with a glorious ungrowth of white in the spring.
Shortly the entire back of the yard will be covered with a jungle of ostrich plume ferns - at last count there were 51 of them - and the trillims will be hidden as the flowers fade. That back bed is wonderful come early July - shades of green and white with the odd flash of yellow, blue or purple: periwinkle, hostas, day lilies, ostrich ferns and even the accursed Bishop's Scourge.