How to Propagate Hypericum × dummeri 'Peter Dummer'?
Propagate from semi-ripe cuttings in summer.

Hypericum × dummeri 'Peter Dummer' · Hypericum × dummeri 'Peter Dummer'
Grow in moderately fertile to poor, moist but well-drained soil in sun or partial shade.
Propagate from semi-ripe cuttings in summer.