Forsythia comes from China and is a member of the olive family. It was once popular to the point of becoming common, almost like a weed. It fell out of favor with homeowners because of its size and unruliness unless pruned regularly. However, the forsythia's beauty and usefulness are worth a little planning and extra effort. Planted in the right place, it need not be pruned at all.
Plant forsythia in rich, well-drained soil. Keep it mulched and well watered. It needs at least six hours of full sun daily. In intense heat and drought, give it a good soak every two weeks. Prune off the very oldest branches after the spring blossoms have all dropped off, but before new buds begin to form. In very cold winters, put some kind of shelter around it. If you don't want to prune, plant it along the edge of your property where it can serve as a backdrop for other plants and flowers. Smaller forsythia shrubs can be planted along paths and around porches.
Weeping forsythias put out suckers that take root in the ground. Use these to "clone" new plants. You can also root a green vine in water to which a few drops of fertilizer have been added. Ask the expert at your local nursery how best to care for forsythia in your climate zone.