The mousetail plant is a vigorous ground cover in rich soil and shade. It will grow in sun, but the leaves get yellowish and damaged rather early in the season.
I have it growing in a number of places round the garden, the rhizomes make thick spreading mats under the soil and prevent anything else taking root.
From time to time I find new colonies of the plant growing in places I have never planted it. So far I treat them
with benign interest but I am aware of the possibility that the plant is slowly taking over the garden.