Stachys byzantina 'Helen Von Stein' (Lamb's Ear 'Helen Von Stein') is grown for its thick, velvety, silver leaves that make a low, touchable groundcover and a bright foil for green plants. You will get a tidy mound 8-12 inches tall, with a spreading habit that can fill 18-24 inches or more over time.
Give it full sun for the best color and dense growth, though it also handles part shade (especially where summers are hot). Plant it in very well-drained soil and avoid constant moisture on the foliage; good air flow helps keep it looking clean in humid weather. Once established, it handles dry spells better than many perennials.
In summer you may see upright spikes of small purple flowers, but this selection is often grown mainly for foliage. If you prefer a pure silver carpet, clip off flower stalks as they appear and shear lightly after bloom to refresh the leaves. Division every few years can reinvigorate older clumps and let you expand a planting.
Use it at the front of borders, along paths, or in rock and gravel gardens where drainage is sharp. It is commonly noted for deer resistance and can add pollinator value when in bloom.