Royal Purple Liriope (Liriope muscari 'Royal Purple') is a popular cultivar of liriope, also known as Lilyturf or Monkey Grass. It is valued for its attractive foliage and ease of care. Here are some key features of Royal Purple Liriope:

1. Foliage: The most distinctive feature of Royal Purple Liriope is its dark purple to almost black strap-like leaves. The foliage provides a rich and bold color, making it stand out in garden landscapes.

2. Growth Habit: Liriope is a clump-forming perennial with arching, grass-like leaves. It typically forms dense, tufted mounds, and individual plants can spread slowly to create a ground cover.

3. Height: Royal Purple Liriope usually reaches a height of about 12 to 18 inches, with the flower spikes extending slightly above the foliage.

4. Flowers: In late summer to early fall, Royal Purple Liriope produces spikes of small, lavender to purple flowers. The flowers add a vertical element to the plant and attract pollinators.

5. Sunlight Requirements: This liriope cultivar prefers partial to full shade. While it can tolerate some sunlight, especially in cooler climates, it tends to perform best in shaded areas.

6. Soil and Watering: Liriope prefers well-draining soil and is adaptable to various soil types. It has moderate water needs and benefits from regular watering, especially during dry periods.

7. Landscape Use: Royal Purple Liriope is commonly used in landscapes as a ground cover, border plant, or as an accent in shaded or partially shaded areas. It works well in mass plantings or mixed with other plants in perennial beds.

8. Hardiness: Liriope is generally hardy and can thrive in a range of climates. Royal Purple Liriope is suitable for USDA hardiness zones 5 to 11.

9. Low Maintenance: One of the advantages of Royal Purple Liriope is its low maintenance. It is relatively resistant to pests and diseases, and trimming back the foliage in late winter or early spring can help rejuvenate the plant.

Royal Purple Liriope is appreciated for its year-round interest, with its striking foliage providing visual appeal even when not in bloom. Its adaptability to different growing conditions and ease of care make it a popular choice for gardeners looking for a reliable and ornamental ground cover.