Snow Cap Arabis is a hardy perennial alpine flower that transforms rock gardens and border edges into cascades of pristine white blooms even when most other plants have faded. Native to the Caucasus region, this vigorous cultivar of Arabis caucasicas grows into a compact 4-6 inch mound studded with delicate half-inch white flowers that bloom generously throughout the season. Cold hardy from zones 3 through 9, it thrives in partial shade and reaches mature size within two years, making it a reliable choice for gardeners seeking season-long color in challenging spots.
Partial Shade
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3-9
6in H x ?in W
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Moderate
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Snow Cap produces dense, continuous blooms in pure alpine white across a remarkably long season, even when heat and drought stress other plants. The tidy mound habit, reaching just 4-6 inches tall, makes it exceptionally useful for edging beds, softening hardscapes, and filling gaps in rock gardens without dominating neighboring plants. Its vigor in hot, arid conditions across North America means it performs where many delicate alpines struggle.
Snow Cap Arabis functions as an ornamental flower valued for rock gardens, alpine troughs, border edging, and cascading over stone walls. Its long blooming season and compact form make it particularly useful for softening hardscape transitions and providing continuous color in early-season gardens when few other plants are flowering.
No timeline data available yet for this variety.
Start seeds indoors 6-8 weeks before the last frost date, pressing them lightly onto moist seed-starting mix without covering, as light aids germination. Maintain soil temperatures around 65-70°F. Seedlings will develop slowly and benefit from consistent moisture and bright, indirect light.
Transplant seedlings outdoors after the last frost date once they've developed 2-3 true leaves. Harden off gradually over 7-10 days by exposing them to increasing outdoor conditions. Space transplants 6 inches apart in prepared garden soil.
Direct sow seeds in fall or early spring where you want plants to grow, pressing them lightly into the soil surface without covering. In colder zones, fall sowing allows natural cold stratification to improve spring germination.
Deadhead spent flowers throughout the blooming season to encourage continuous flowering and maintain the neat mounded form. After blooming ends, a light trim to remove any straggly growth keeps plants compact and tidy for the following year.
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“Snow Cap Arabis represents the cultivar tradition of selecting superior forms of Arabis caucasicas, a species native to the Caucasus Mountains. While specific development details are not documented in the sources, this open-pollinated cultivar carries the genetic heritage of wild alpine populations adapted to harsh mountain conditions, refined through generations of seed saving to produce reliably compact growth and prolific flowering.”