Forsythia x intermedia is an ornamental deciduous shrub of garden origin.
The shrub has an upright habit with arching branches and grows to 3 to 4 metres high. The opposite leaves turn yellowish or occasionally purplish in the autumn before falling. The usually pale-yellow flowers are produced on one- to two-year-old growth and may be solitary or in racemes from 2 to 6. [Wikipedia]