False Rockcress Plants: Learn How To Grow Aubrieta Groundcover

False Rockcress Plants: Learn How To Grow Aubrieta Groundcover

By: Bonnie L. Grant, Certified Urban Agriculturist
Image by ClaraNila

Aubrieta (Aubrieta deltoidea) is one of the earliest bloomers in spring. Often part of a rock garden, Aubretia is also known as false rockcress. With its darling little purple flowers and dainty leaves, Aubrieta will scramble over rocks and other inorganic items, covering them with color and distracting the eye. Aubrieta groundcover is also remarkably drought tolerant once established and can handle the harsh heat of a full sun rockery. Read on for some tips on the care of Aubrieta and how to use this magical little plant in the garden.

Aubrieta Growing Conditions

Aubrieta is a perennial suited for United States Department of Agriculture zones 4 to 8. This temperate to cool region plant can spread up to 24 inches (61 cm.) over time and forms lovely purple carpets of color in spring. It is non-invasive and self-sufficient for the most part. Learn how to grow Aubrieta in your landscape so you can enjoy its charm in your border, rockery or even container garden.

False rockcress plants prefer full sun and well-drained soil. The plant prefers sites that are rich in lime. These easy-care plants are also adapted to partial shade locations but some blooms may be sacrificed. Aubrieta is a member of the mustard family, a notoriously tough group of plants. It is deer resistant and tolerant of drought once established.

Once the full heat of summer is released, the plants tend to die back a bit and in fall much of the foliage will disappear in cooler climates. Aubrieta groundcover can tend to get a bit scraggly over time and responds well to shearing back after bloom or in fall.

How to Grow Aubrieta

Aubrieta grows well from seed. It is easy to establish and requires a minimum of water as the seedlings grow. Choose a sunny spot in the garden in early spring with well-draining soil or alternately start seeds indoors in flats 6 to 8 weeks before planting outdoors.

Remove any debris and till soil to a depth of 6 inches (15 cm.). Sow seeds on the surface of the soil. Water gently with a diffuser attachment to prevent drowning seeds and pushing them under too much soil. Keep the area moderately wet but not soggy.

Once seedlings appear, keep weed pests from the area and thin plants to one every 10 inches (25 cm.). Over the spring, false rockcress plants will gradually spread out to cover the area in a thick carpet. Young plants may develop a few spotty flowers but a full flush of blooms should not be expected until the following year.

Care of Aubrieta

These little plants couldn’t be easier to manage. Cutting the plants back after bloom can discourage seeding and keep the plants compact and tight. Every 1 to 3 years dig up the plant and divide to prevent center die out and propagate more plants for free.

Keep Aubrieta moderately moist especially during the growing season. False rockcress has few disease or insect pest issues. The most common problems occur where soil is clay or drainage is poor. Make sure you amend soil and check for percolation prior to planting them out.

There are several cultivars available with flowers of red, lilac and pink. These lovely plants are beautiful cascading over a wall or even a container. They tend to look a little sad in early spring, as some of the foliage will have dropped but quickly recover with warming temperatures and spring rain.

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