How to Prune weeping forsythia?
Cut flowered growth back to strong young shoots below, removing up to a fifth of old stems near the base each year. Prune immediately after flowering.

weeping forsythia · Forsythia suspensa
Also known as: golden bells; Japanese golden bell tree
Grows best in moist but well-drained soil in full sun
Cut flowered growth back to strong young shoots below, removing up to a fifth of old stems near the base each year. Prune immediately after flowering.