I don't know how these girls survive with the abuse they take.
First they were planted in a low area (not by me, although I have never moved them to a better spot) so they get drowned in water every spring and fall.
Then, after they have bloomed, the grass starts to grow and they get mowed down on a weekly basis along with the lawn.
But, they survive they do, and this clump gets larger every year and they have spread to three other clumps as well.