Stachys byzantina 'Cotton Boll'
- Position: full sun
- Soil: well-drained, moderately fertile soil
- Rate of Growth: average
- Flowering period: June to September
- Flowers: purple
- Other features: large, greyish-white, felted leaves
- Hardiness: fully hardy
Cotton ball-like clusters, which make attractive additions to dried arrangements, form on the upright flower spikes throughout summer. This sun-loving, evergreen groundcover has softly felted silver foliage and will thrive in poor soils.
- Garden care: Pick off and destroy any foliage that becomes infected by powdery mildew and treat the remaining leaves with fungicide. Lift and divide large clumps in early spring.