Sky Pencil Holly (Ilex crenata 'Sky Pencil') is a unique and popular evergreen shrub known for its distinctive upright, columnar growth habit. Here are some key features of the Sky Pencil Holly:

1. Growth Habit: The most notable feature of Sky Pencil Holly is its narrow, upright, and columnar growth habit. It forms a dense, vertical shape without the need for extensive pruning.

2. Foliage: The glossy, dark green leaves are small and narrow, contributing to the plant's sleek appearance. The foliage is evergreen, providing interest throughout the year.

3. Size: Sky Pencil Holly typically reaches a mature height of 6 to 8 feet, with a width of only 2 to 3 feet. This compact size makes it suitable for tight spaces or as an accent plant.

4. Berries: Female Sky Pencil Hollies produce small, inconspicuous white flowers in spring, which are followed by black berries in the fall. The berries add visual interest and can attract wildlife.

5. Sunlight Requirements: Sky Pencil Holly prefers full to partial sun. It tends to perform best when planted in a location with adequate sunlight.

6. Soil and Watering: Well-drained soil is essential for the health of Sky Pencil Holly. It benefits from regular watering, especially during dry periods, but is generally considered drought-tolerant once established.

7. Versatility: Due to its narrow form, Sky Pencil Holly is often used as an accent plant, in containers, or as a hedge or border plant. It works well in both formal and informal landscape designs.

8. Hardiness: This holly cultivar is hardy in USDA zones 5 to 8, making it suitable for a range of climates.

When planting Sky Pencil Holly, consider its specific growth habits and preferences. It's a versatile and elegant plant that can add vertical interest to various garden settings. Proper spacing, well-draining soil, and regular watering will contribute to its optimal growth and performance.