It is a certain sign that spring has arrived when the forsythia shrubs are adorned with golden yellow blooms. Here is a hardy, rapid growing, upright growing shrub which reaches 3-8 ft. tall with a 3-8 ft spread. If you want to prune it do it right after flowering as it will bloom again the next year on existing stems. It lives a great live in average, well-drained soil and excels in blooming in full sun.