Here are some key features and information about Forsythia x intermedia, often referred to as "Yellow Bells" or simply "Forsythia":

1. Flowers: Forsythia is renowned for its profusion of bright yellow, bell-shaped flowers that appear in early spring. The flowers typically precede the emergence of leaves, creating a stunning display.

2. Foliage: The shrub has simple, opposite leaves that are usually green. The foliage develops after the flowers.

3. Growth Habit: Forsythia x intermedia typically has an upright and arching growth habit, forming a dense thicket of branches.

4. Size:Forsythia can grow to various heights, often reaching around 4 to 6 feet tall.

5. Sun Requirements: Forsythia prefers full sun to partial shade for optimal flowering. It is adaptable to different light conditions but blooms best in full sunlight.

6. Soil Preferences: Well-draining soil is preferable. Forsythia can tolerate various soil types but thrives in fertile, moist, and well-drained soil.

7. Pruning: Pruning is often done after flowering to maintain the shape of the shrub and encourage new growth for the following season.

8. Hardiness: Forsythia is generally hardy and can tolerate a range of climates. It is appreciated for its resilience and ability to thrive in various soil and weather conditions.