Seed Needs, Purple Rockcress Groundcover (Aubrieta deltoidea) 1,200 Seeds Quality Rockcress seeds packaged by Seed Needs. Packets are 3.25" wide by 4.50" tall and come with a full colored illustration on the front side, as well as detailed sowing instructions on the reverse. Purple rockcress is a perennial flowering plant that produces small purple flowers. It will only grow to a mature height of just 4 to 6 inches tall, and is aptly named for its use in rock gardens and as a groundcover. Because Purple Rockcress is categorized as a perennial flowering plant, it will grow the first year and return the following year from roots. Aubrieta is a sweetly scented groundcover that will attract an array of beneficial insects such as bumblebees, hummingbirds, as well as butterflies & ladybugs. All Nasturtium seeds sold by Seed Needs are Non-GMO based seed products and are intended for the current & the following growing season. All seeds are produced from open pollinated plants, stored in a temperature controlled facility and constantly moved out due to popularity.