Thriller Lady's Mantle has chartreuse flowers on arching stems during its long blooming time from mid-Spring to mid-Summer.  The plant has lovely scalloped leaves that will hold droplets of water. It can be used in borders, containers, groundcover, and edging. Reseeding can be controlled with deadheading flowers
 
A. mollis will grow in nearly any moist, shady area that is well-drained. In the cooler summers of northern zones, they will grow in full sun if kept consistantly moist. In the south, they must be sheltered from the harsh afternoon sun and should be planted in fertile, moist soil. Bloom time may be reduced in hot climates. In the north, favorable conditions allow this plant to self-seed freely, with new plantlets popping up all around the original clump. They are easily lifted if they appear where they are not wanted. Because of the hairy foliage which traps water easily, it does not do well in areas where short, heavy downpours are immediately followed by hot, humid afternoons. These conditions encourage foliar diseases which may be cleared up by use of a fungicide.
 
From Walters Gardens https://www.waltersgardens.com/variety.php?ID=ALCMO