Grow Achillea millefolium 'Sunny Seduction' when you want bright, sunny color with a tidy, sturdy habit. This yarrow produces broad, flat-topped clusters of buttery yellow blooms over finely cut, ferny foliage, creating a crisp look in borders and pollinator plantings.
At maturity it typically stands about 24-30 inches tall, with a similar spread. The flower heads are excellent for cutting, and deadheading helps keep the plant looking fresh and encourages additional bloom through the season.
Give it full sun for the strongest stems and best flowering, but it will also perform in part shade. Plant in well-drained soil; once established, it handles dry periods well. Avoid consistently wet sites, especially in winter, and provide good air flow if your summers are humid.
For easy care, water new plants until rooted in, then taper to occasional deep watering during extended heat. Divide clumps every few years if you want to refresh vigor and control size. Leave stems up for seasonal interest, then cut back hard in early spring before new growth starts.