Orostachys aggregata is a low-growing alpine succulent that brings architectural charm to rock gardens and ground cover plantings across zones 5 through 8. This sedum-like perennial forms compact rosettes of thick, grayish-green leaves that deepen to purplish tones as temperatures drop in fall, then sends up delicate spikes of white to pale yellow flowers in late summer and early fall. Reaching just 3 to 6 inches tall but spreading to 12 inches or more over time, it spreads gently through plantlets that form along its stolons, gradually colonizing space without becoming invasive. The genus name itself tells its mountain heritage: oros meaning mountain, stachys meaning spike, capturing both its alpine origins and its distinctive flower form.
Full Sun
Moderate
5-8
6in H x 12in W
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Moderate
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Orostachys aggregata spreads slowly and deliberately through plantlets rather than aggressive runners, giving you control over its movement through the garden. Its foliage shifts from cool grayish-green to wine-purple as fall arrives, offering two distinct seasonal looks. The plant thrives where drainage is excellent and summer moisture is low, making it genuinely content in sandy, lean soils that would challenge other perennials. Late-summer spikes of tiny flowers arrive when many gardens are beginning to fade, and it asks almost nothing in return except full sun and well-drained ground.
Orostachys aggregata works beautifully as a low ground cover in rock gardens, alpine troughs, and xeriscape plantings where you want color and texture without height. Space plants 12 inches apart and they'll gradually weave together into a soft carpet, ideal for naturalized settings where you're creating the appearance of spontaneous alpine growth rather than formal, manicured beds.
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Site plants 12 inches apart in spring or early fall, once the soil has warmed above 50 degrees Fahrenheit. Space them to allow room for gradual spread without crowding; plants will eventually touch and merge into a cohesive ground cover.
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