Compacta holly refers to a cultivar of Japanese holly (Ilex crenata) called 'Compacta.' Here's some information about this specific plant:

1. Appearance: Ilex crenata 'Compacta' is an evergreen shrub known for its dense, compact growth habit. It typically grows to a height and width of 4 to 6 feet, though it can be pruned to maintain a smaller size. The leaves are small, glossy, and dark green, similar in appearance to boxwood leaves.

2. Sunlight: Compacta holly thrives in partial to full sun but can tolerate some shade. It's adaptable to various light conditions but will perform best with at least a few hours of direct sunlight per day.

3. Soil: It prefers well-draining, slightly acidic to neutral soil. However, it can tolerate a range of soil types, including sandy, loamy, or clay soils.

4. Watering: Keep the soil consistently moist but not waterlogged, especially during the establishment period. Once established, Compacta holly is relatively drought-tolerant but will benefit from regular watering during dry spells.

5. Pruning: Pruning can be done as needed to maintain the desired shape and size. It's best to prune in late winter or early spring before new growth begins. Remove any dead, damaged, or crossing branches, and prune lightly to encourage dense growth.

6. Fertilizing: Apply a balanced fertilizer in spring to promote healthy growth. Follow the manufacturer's instructions for application rates.

7. Pest and Disease Resistance: Compacta holly is generally resistant to pests and diseases. 

8. Landscape Uses: Compacta holly is commonly used as a low hedge, border plant, or specimen shrub in landscapes. Its compact size and neat appearance make it particularly well-suited for smaller gardens, foundation plantings, or tight spaces.

Overall, Ilex crenata 'Compacta' is valued for its dense growth habit, glossy foliage, and adaptability to different growing conditions. It's a popular choice for adding structure, greenery, and privacy to landscapes.