Rock cress, also known as Aubretia or Aubrieta deltoidei, is similar to creeping phlox in terms of being a bright ground cover plant. However, they are not the same plant. While they share some similarities, there are also distinct differences between them.
1. Appearance:
Rock cress and creeping phlox both have small, vibrant flowers that create a carpet-like effect when planted en masse. However, the flowers of rock cress are typically a bright purple color, while creeping phlox offers a wider range of colors including pink, white, blue, and lavender.
2. Growth Habit:
Rock cress is a low-growing perennial that forms dense mats of foliage. It has trailing stems that spread outwards and can reach up to 6 inches in height. Creeping phlox, on the other hand, has a slightly taller growth habit, reaching around 6-8 inches in height. Its stems also spread out but tend to be a bit more upright compared to rock cress.
3. Water Requirements:
One of the advantages of rock cress is its ability to thrive in dry conditions. It is highly drought-tolerant and requires very little water to survive. Creeping phlox, while still relatively low-maintenance, may need more regular watering to keep it healthy and blooming.
4. Hardiness:
Both rock cress and creeping phlox are hardy plants that can withstand cold temperatures and even thrive in rocky or poor soil conditions. However, rock cress is typically more tolerant of harsh conditions, including extreme cold and heat, making it a great choice for challenging environments.
5. Uses:
Rock cress and creeping phlox are commonly used as ground covers in garden beds, rock gardens, or along pathways. They provide excellent erosion control and add a splash of color to otherwise dull areas. Rock cress is particularly well-suited for cascading over walls or in hanging baskets due to its trailing habit.
While rock cress and creeping phlox share some similarities, they are not the same plant. Rock cress, also known as Aubretia, has bright purple flowers, a low-growing habit, and is highly drought-tolerant. Creeping phlox offers a wider range of flower colors, has a slightly taller growth habit, and may require more regular watering. Both plants are hardy and make excellent ground covers for various garden settings.