How to Prune mock orange 'Erectus'?
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.

mock orange 'Erectus' · Philadelphus 'Erectus'
Grow in a moderately fertile, moist but well-drained to well-drained soil in full sun or partial shade; well suited to a woodland setting
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.