Aubrieta Rock Cress, also known as purple rock cress, is a popular groundcover known for its vibrant purple blooms and ease of care. This low-growing perennial, a member of the Brassicaceae family, thrives in rocky areas and is perfect for adding a splash of color to rock gardens, walls, and slopes. This guide will provide everything you need to know about growing and caring for aubrieta rock cress.
Choosing the Right Aubrieta for Your Garden
While aubrieta is most commonly associated with its signature purple hue, there are other varieties available, including Arabis caucasica (rock wall cress), which boasts white or pink flowers. Both species form attractive mounds, ideal for edging retaining walls or filling spaces in rock gardens. Consider your desired color scheme and preferred bloom time when selecting your aubrieta.
Planting Aubrieta Rock Cress
Hardy in USDA plant hardiness zones 4-7, aubrieta rock cress is remarkably easy to grow. Seeds can be sown directly into the garden in early spring or started indoors four to six weeks before the last expected frost. Choose a location that receives full sun, although aubrieta will tolerate some shade, particularly in warmer climates. Space plants 15 to 18 inches apart to allow them to spread and form a dense mat.
Caring for Aubrieta Rock Cress
Aubrieta requires minimal care once established. Water regularly after planting, but reduce watering once the plant is established, only watering when the soil is dry. It thrives in well-draining soil that is slightly acidic. A light layer of pine needle mulch can help retain moisture and increase soil acidity.
Fertilizing and Pruning
A high-nitrogen fertilizer can be applied during initial planting, followed by a phosphorus-rich fertilizer after blooming. Aubrieta typically blooms in its second spring and every year thereafter, showcasing a vibrant display of color from April through mid-May. Regular pruning to remove dead flowers encourages new growth and maintains the plant’s health and vigor.
Pest and Disease Control
Aubrieta rock cress is generally resistant to pests and diseases, making it a low-maintenance choice for gardeners. However, in some cases, aphids or other common garden pests might appear. If necessary, treat with an appropriate insecticide following label instructions.
Enjoying Your Aubrieta Rock Cress
With its vibrant color, ease of care, and adaptability to challenging growing conditions, aubrieta rock cress is a rewarding addition to any garden. Whether used as a groundcover, border plant, or cascading over a wall, aubrieta will provide years of beauty with minimal effort.
