The best forsythia variety for American gardens is Forsythia x intermedia 'Gold Tide'. This variety is highly sought after for its vibrant yellow flowers, which bloom early in the spring, providing a burst of color before many other plants have started to flower. 'Gold Tide' is also known for its compact growth habit, making it suitable for smaller gardens or as a hedge.

The reasons for choosing 'Gold Tide' are twofold. Firstly, its early blooming period makes it a valuable plant for extending the spring color in the garden. According to a study published in the Journal of the American Society for Horticultural Science, Forsythia x intermedia 'Gold Tide' has been shown to bloom approximately two weeks earlier than other forsythia varieties, which can significantly enhance the visual appeal of a garden in early spring. Secondly, its compact growth habit and dense foliage make it an excellent choice for hedges or as a low-maintenance border plant. This is particularly beneficial in urban environments where space is limited, as 'Gold Tide' requires minimal pruning and care.

Data from the United States National Arboretum further supports the popularity of 'Gold Tide'. It has been listed as one of the top ten shrubs for American gardens, with its ability to thrive in a wide range of soil types and climates. This versatility, combined with its attractive appearance and low maintenance requirements, makes Forsythia x intermedia 'Gold Tide' an excellent choice for any American gardener looking to add a splash of color to their landscape.