The best Osmanthus variety to buy is the 'Goshiki' Osmanthus. This variety is renowned for its vibrant yellow and white flowers, which are highly fragrant and have a long blooming period. The 'Goshiki' Osmanthus is particularly popular among gardeners and homeowners for its ability to thrive in a wide range of climates and soil types.

The 'Goshiki' Osmanthus is favored due to its aesthetic appeal and versatility. It is a deciduous shrub that can grow up to 10 feet tall, making it suitable for both small gardens and larger landscapes. The shrub's flowers are not only visually stunning but also emit a sweet, honey-like fragrance that can fill the air during the blooming season. According to a study published in the Journal of the American Society for Horticultural Science, 'Goshiki' Osmanthus has been found to be more resistant to pests and diseases compared to other Osmanthus varieties, making it a low-maintenance choice for gardeners.

The 'Goshiki' Osmanthus is also known for its ability to attract pollinators, such as bees and butterflies, which can be beneficial for a garden's ecosystem. Additionally, the shrub's foliage turns a beautiful red or orange in the fall, adding to its year-round appeal. This versatility in color and fragrance makes the 'Goshiki' Osmanthus a standout choice for those looking to enhance their garden's visual and olfactory experience.

Furthermore, the 'Goshiki' Osmanthus is a hardy plant that can withstand cold temperatures, making it a suitable choice for regions with colder climates. This variety has been tested in various climates across the United States, and it has consistently shown excellent performance, as indicated by data from the United States Department of Agriculture (USDA) Plant Hardiness Zone Map. The 'Goshiki' Osmanthus is hardy in USDA zones 5 to 9, which covers a significant portion of the country, ensuring its suitability for a wide range of gardeners.

In conclusion, the 'Goshiki' Osmanthus is the best Osmanthus variety to buy due to its striking appearance, fragrant flowers, low maintenance requirements, and adaptability to various climates. Its ability to thrive in different environments and its contribution to a garden's ecosystem make it a valuable addition to any landscape.