Arabis blepharophylla aka Rose Rockcress

Arabis blepharophylla is endemic to a small region of coastal California, primarily the San Francisco Bay Area and the low-elevation California Coast Ranges. In the wild it is found in Contra Costa, Marin, San Francisco, San Mateo, Santa Cruz, and Sonoma counties, growing on rocky hillsides, coastal bluffs, and grasslands at elevations of 50-200 m. It is classified as rare in the wild and is not native to any other part of the world.

The flowers of Arabis blepharophylla are sweet-scented, one of the traits that has contributed to its popularity as a garden plant. The fragrance is most noticeable during the bloom period in late winter and early spring.

Arabis blepharophylla produces small flowers with four bright purplish-pink petals arranged in clusters atop hairy stems, typical of the mustard family. Sepals are also purple. Bloom time extends from as early as December through April, with peak flowering in March and April. Fruits that follow are erect, slightly torulose siliques 2-4 cm long with winged seeds.

The cultivar 'Frühlingszauber' (sometimes sold as 'Spring Charm') is the best-known selection of Arabis blepharophylla and has received the Royal Horticultural Society's Award of Garden Merit. Several other cultivars bred for ornamental use exist, generally selected for flower color intensity and compact habit.

Arabis blepharophylla is strictly an outdoor plant suited to gardens in mild, Mediterranean-type climates. In the wild it grows in Northern Coastal Scrub, Mixed Evergreen Forest, and Coastal Prairie habitats along the California coast, and it performs best in cultivation under similar cool, well-drained conditions. It is rare in the wild (Calflora rarity rank 4.3) and has cultural value as a native California plant for wildlife gardens.

New growth will sprout from the top of the Rose Rockcress as it grows vertically.

Rose Rockcress should be watered regularly, allowing the soil to dry out between waterings.

Rose Rockcress loves a well-draining soil. Perlite and vermiculite help with drainage, while coco coir adds organic matter, so a good potting soil mix will have all three. You can improve store-bought soil by adding some perlite to it.

Rose Rockcress requires abundant, bright, and direct light to thrive. The best placement for this plant is within one foot of a window to ensure it receives enough light. If you live in an area with more extreme weather, such as hot summers or cold winters, you may need to adjust the placement of the plant accordingly. During hot summer months, it is important to place the plant away from full sun, as this can cause the leaves to yellow or burn. During cold winter months, it is best to move the plant closer to the window to take advantage of the extra light that can help it survive. By keeping an eye on the current weather in your area, you can make sure your Carmine Rose Rock Cress is always in the right place to thrive.

There is no verified data on the toxicity of this plant in the records of Ploi. If any person, including yourself, a family member, or a pet, consume plant material with an uncertain toxicity level, it is advisable to seek the advice of a healthcare expert.