Limelight hydrangea (Hydrangea paniculata 'Limelight') is a popular cultivar of hydrangea known for its large, showy, cone-shaped flower heads and its hardiness. Here are some key characteristics and tips for growing Limelight hydrangeas:

1. Appearance: Limelight hydrangeas have large, cone-shaped flower heads that start out a soft, pale green in early summer, gradually turning creamy white, then finally developing pinkish tones in late summer and fall. The foliage is a rich green color and provides a lovely backdrop for the flowers.

2. Hardiness: Limelight hydrangeas are generally hardy in USDA zones 3-9, making them suitable for a wide range of climates.

3. Sunlight: These hydrangeas prefer full sun to partial shade. They will tolerate more sun than some other hydrangea varieties, but they may benefit from some afternoon shade in hot climates.

4. Soil: Well-draining soil is essential for Limelight hydrangeas. They prefer slightly acidic to neutral soil with good organic content.

5. Watering: Keep the soil consistently moist but not waterlogged, especially during hot, dry periods. Mulching around the base of the plant can help retain moisture and regulate soil temperature.

6. Pruning: Limelight hydrangeas bloom on new wood, so they can be pruned in late winter or early spring before new growth begins. You can cut them back by up to one-third of their height to encourage bushiness and a strong framework. Deadheading spent flowers can also promote continued blooming.

7. Fertilizing: Fertilize Limelight hydrangeas in early spring with a balanced slow-release fertilizer or a fertilizer formulated specifically for hydrangeas.

8. Landscape Uses: Limelight hydrangeas are versatile plants that can be used as focal points in the landscape, planted in groups for a dramatic effect, or used as hedges or screens. They also make beautiful cut flowers for arrangements.

Overall, Limelight hydrangeas are prized for their beautiful blooms, easy care, and versatility in the landscape, making them a favorite among gardeners.