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Forsythia hybrids: various species of forsythia have been crossed to produce hybrids that are more cold hardy. These include the following:
- 'Happy Centennial'- 2 1/2 feet tall, flowers heavily, flower buds are cold hardy.
- 'Meadowlark'- 6 to 9 feet tall, flowers heavily, flower buds cold hardy, arching branches.
- 'New Hampshire Gold'- 5 feet tall, deep yellow flowers, flower buds are cold hardy.
- 'Northern Gold'- 6 to 8 feet tall, flower buds are cold hardy, upright habit.
