'Autumn Ivory' Encore Azaleas, or Rhododendron ‘Roblev’, are a popular series of evergreen azalea hybrids developed for their ability to bloom multiple times a year. Unlike traditional azaleas that typically bloom in spring, Encore Azaleas can produce flowers in spring, summer, and fall, providing an extended flowering season. Here are some key features and care tips for 'Autumn Ivory' Encore Azaleas:

1. Reblooming: The primary characteristic of Autumn Ivory Encore Azaleas is their ability to rebloom. They often have three distinct blooming periods: spring, summer, and fall.

2. Bloom Colors: Encore Azaleas are available in a range of colors, including shades of pink, purple, red, white, and bicolor varieties. Autumn Ivory presents a wonderful white bloom.

3. Size: Encore Azaleas typically have a compact and well-branched growth habit. Their typically height is 4 feet with a similar spread, making them suitable for various garden settings.

4. Sunlight Requirements: While Encore Azaleas prefer partial shade, they can tolerate more sunlight than traditional azaleas. They generally do well in areas with filtered sunlight or morning sun.

5. Soil Conditions: Well-draining, acidic soil is ideal for Encore Azaleas. Adding organic matter to the soil and mulching around the base of the plants helps retain moisture.

6. Watering: Provide regular watering, especially during dry periods. These azaleas prefer consistent moisture but should not be kept excessively wet.

7. Pruning: Pruning is generally done after the spring bloom to shape the plants and encourage branching. Avoid heavy pruning after August to allow buds to set for the next blooming period.

8. Fertilization: Fertilize Encore Azaleas in spring with a slow-release, acid-forming fertilizer (Holly Tone.) 

Encore Azaleas are valued for their extended bloom time, vibrant colors, and relatively low maintenance.