False Rockrose, Aubrieta, is a mat-forming groundcover often seen spilling over rock walls or in rock gardens. It forms a beautiful blanket of tiny bright purple to pink flowers in spring.
Aubrieta is a low-growing perennial of the Mustard family. You will find various spellings of the name; it has also been spelled Aubrietia.
Aubrieta grows well in semi-shade. It grows to a maximum height of 12 inches. The attractive silvery-green foliage covers spaces between rocks and along borders. In spring and early summer the flowers, when grown in masses, form a blanket of rosy-purple, blue, or lilac. They look especially well combined with Arabis or alyssum.
Plants are grown from seed sown the previous season, or they may be propagated by layering the trailing shoot or by the division of the mats or clumps.
Get to know Aubrieta
- Plant type: Perennial
- Growing Zones and range: 4-8
- Hardiness: Best where summer humidity and temperatures are not excessive
- Height and width: 6 to 8 inches tall (15-20cm); 8 to 12 inches (20-30cm) wide
- Form: Low, mounding plant with weak stems clothes in sparsely toothed evergreen leaves; plants spread by rhizomes
- Flower form: Four-petaled 3/4- inch flowers may be white, rose, or purple
- Use: Groundcover on slopes and in rock gardens; edging at front of beds and borders
- Bloom time: Early to mid-spring, during bulb blooming season
- Botanical name: Aubrieta deltoidea
- Common name: False Rockrose
Where to plant Aubrieta
- Plant Aubrieta in full sun
- Aubrieta grows best in well-drained rocky or stony soil. Add grit or sand to loamy soil.
When to plant Aubrieta
- Set out established plants in spring.
- Sow seed indoors or outdoors from spring to fall.
- Divide Aubrieta in fall. Take stem cuttings after flowering.
Planting and spacing Aubrieta
- Space Aubretia 12 to 18 inches apart.
How to water and feed Aubrieta
- Fertilize Aubrieta lightly if at all.
- Mulch around Aubrieta to conserve soil moisture.
- Cut back plants by two-thirds after blooming to False Rockrose compact.
- Aubrieta is susceptible to aphids, nematodes, and flea beetles.
- Aubrieta is susceptible to root rot if not in well-drained soil.
Aubrieta pests and diseases
- Plant in well-drained soil to avoid root rot, especially where nighttime temperatures are high.
- Aubrieta is a short-lived perennial. Start cuttings every year to replace spent plants.
Aubrieta varieties to grow
- Aubretia x cultorum, Aubreria, rock cress: Hybrids sometimes listed as A. deltoidea as one of the parent species; these are low-growing, mat-forming perennials that grow to 2 inches high and spread to feet; bears single and double flowers in pink, purple, mauve, violet purple, magenta, and red. Cultivars include: ‘Aurea Variegata’ has yellow-variegated leaves and blue-violet flowers; ‘Carnival’ has a profusion of violet flowers; ‘Purple Gem’ has royal purple flowers; ‘Royal Blue’ has dark blue flowers.
Aubrieta deltoidei — Rock Cress
Aubrieta deltoidei is a ground-hugging perennial that creates sheets of color in early spring. The ¾-inch-wide, four-petaled flowers bloom in small clusters on short stems in profusion that nearly hides the foliage. Flowers may be shades of purple, rose, or blue. The 1-inch-long, gray-green, evergreen leaves, are wedge-shaped, toothed, and hairy, cloaking creeping stems with soft color year-round.
- Size: Foliage forms 3- to 5-inch-high wide-spreading mat; flowers 6 to 8 inches tall.
- Light: Full sun.
- Soil and moisture: Average to sandy, neutral to alkaline soil and perfect drainage; moderate moisture.
- Planting and propagation: Plant container grown plants in spring, spacing 2 feet apart. Divide in fall. Take cuttings in summer after flowering.
- Special care: Shear off spent flowers to encourage reblooming; shear again in summer if leggy.
- Pests and diseases: Root rot if not well drained.
- Climate: Zones 4-8; best with low humidity and cool nights. Does poorly in the South.
- Cultivars and similar species: ‘Purple Gem,’ purple, 6 inches tall; ‘Cascade,’ shades of purple, 4 to 6 inches tall; ‘Royal Blue,’ shades of blue, lavender, and violet; ‘Royal Red,’ shades of red, purple, and magenta; ‘Red Cascade,’ red; ‘Variegata,’ gold-edged green leaves, blue flowers.
- Garden use: Arrange to spill over rocks and out of crevices in rock gardens and walls. Treat as biennial in spring bulb bedding.
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