The Sester Blue Dwarf Spruce is a cultivar of the Colorado spruce, scientifically known as Picea pungens 'Sester Dwarf Blue'. Here are some key points about this plant:

1. Appearance: Sester Blue Dwarf Spruce is a compact, dwarf evergreen tree with a dense, rounded form. It typically grows slowly and maintains a neat, symmetrical shape without requiring much pruning. The needles are short, stiff, and sharp-pointed, measuring about 1/2 to 3/4 inch (1.3 to 1.9 cm) long, and are arranged densely along the branches. The foliage has a distinctive blue-gray color, which adds to its ornamental appeal.

2. Size: This cultivar typically reaches a mature height of 3 to 4 feet (0.6 to 1.2 meters) and a spread of 3 to 4 feet (0.9 to 1.5 meters), making it a compact and manageable option for smaller landscapes, rock gardens, or container plantings.

3. Growth Rate: Sester Blue Dwarf Spruce is a slow-growing tree, adding only a few inches of growth per year. Its compact size and slow growth rate make it suitable for use as a specimen plant or in rock gardens.

4. Sun and Soil Requirements: This tree prefers full sun to partial shade and thrives in well-drained soil with good moisture retention. It can tolerate a range of soil types, including loamy, sandy, or clay soils, as long as they are not overly wet or waterlogged.

5. Hardiness: Sester Blue Dwarf Spruce is cold-hardy and can tolerate freezing temperatures typical of its native range in western North America. It is suitable for USDA hardiness zones 2 to 8.

6. Landscape Use: Due to its compact size and attractive blue-gray foliage, Sester Blue Dwarf Spruce is often used as a specimen plant in smaller gardens, rock gardens, or container plantings. It can also be used to provide evergreen interest in mixed borders or as a low hedge or screen.

Overall, Sester Blue Dwarf Spruce is a charming and versatile evergreen tree with a neat, compact habit and distinctive blue-gray foliage. Its slow growth rate and cold-hardiness make it an excellent choice for gardeners seeking a low-maintenance tree for smaller landscapes or container gardens.