Forsythia Cuttings Propagation. The best time to propagate forsythia is june and july when the plant produces vigorous new shoots. If you want to use hormones on your cutting i would recommend using dip n grow at 3000 parts per million or hormodin 1 0 1 iba.
Even beginners will have success with this easy to root plant. Winter rooting can also be done with pencil sized cuttings if you do not have a high enough success rate with rooting this spring and summer. These hormones were the most successful in my forsythia cuttings.
Good luck with this.
Forsythia are fun to propagate and you can easily grow several more plants from an existing mature hedge. Forsythia can be propagate from soft wood cuttings. Most garden experts recommend rooting forsythia indoors between december and february. Winter rooting can also be done with pencil sized cuttings if you do not have a high enough success rate with rooting this spring and summer.