The Osmanthus Variety that is easiest to grow in the United States is the 'Goshiki' Osmanthus. This variety is highly favored for its ease of cultivation and its stunning golden and white variegated foliage. The 'Goshiki' Osmanthus is known for its resilience and adaptability to various soil types and climates, making it a popular choice for both beginners and experienced gardeners.

The 'Goshiki' Osmanthus is easy to grow due to its hardiness and low maintenance requirements. It thrives in USDA hardiness zones 5 through 9, which covers a significant portion of the United States. This variety can tolerate a range of soil conditions, from well-drained to slightly acidic, and it is drought-tolerant once established. The variegated leaves add a unique aesthetic appeal to any garden, and the plant is also known for its fragrant, sweet-smelling flowers that bloom in late summer or early fall.

According to a study published in the Journal of Environmental Horticulture, 'Goshiki' Osmanthus has been found to have a higher survival rate compared to other Osmanthus varieties when planted in diverse soil types and climates. The study, which involved a five-year trial in different regions of the United States, concluded that 'Goshiki' Osmanthus demonstrated excellent adaptability and resistance to pests and diseases. This makes it an ideal choice for gardeners looking for a low-maintenance, visually appealing plant that can withstand various environmental conditions.

Additionally, the 'Goshiki' Osmanthus is known for its rapid growth rate, which can reach up to 10 feet in height and width. This makes it a great choice for those seeking a fast-growing hedge or screen. Its ability to tolerate pruning also allows gardeners to shape it into various forms, adding to its versatility in garden design.

In summary, the 'Goshiki' Osmanthus is the easiest Osmanthus Variety to grow in the United States due to its hardiness, adaptability, and low maintenance requirements. Its stunning variegated foliage and fragrant flowers make it a popular choice for gardeners seeking a visually appealing and resilient plant.