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How to root forsythia 
Root forsythia after the bush has finished blooming and all of its flowers have fallen off. 
Most garden experts recommend rooting forsythia indoors between december and february. The plant is dormant during this time, so the plant will be in the hardwood stage and cuttings will be less perishable.
Available options:
[a]. You can root forsythia year-round, but cuttings taken when the bush isn't dormant will be more fragile and require more care and attention. Grow forsythia in well-drained, acidic soil and lots of shade.
[b]. Determine if the plant has been kept indoors, or if you need to create an area that will be livened up by new plants. In some countries, the support system for plants will also be installed so the roots of the plants will appreciate irrigation.
[c]. Other perentivates may be able to be rooted, and they are usually ready to harvest very soon. If you haven't done so already, prepare some perlite and place it on the ground to trap the root cells.
[d]. Root your plant a few weeks before it is time to plant it. That way, you have a few weeks before you plant it.
[a].