Troubleshooting
weeping forsythia problems — and how to fix them
weeping forsythia (Forsythia suspensa) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Failure to flower
The most common cause is pruning in autumn or winter, removing the flowering wood formed on the previous season's growth. Prune only right after flowering finishes in spring.
Frost damage to buds
In areas with late hard frosts, flower buds can be killed after swelling. Selecting a sheltered, south-facing wall position or applying fleece during sharp frost events can help protect buds.
Galls and dieback
Crown gall (Agrobacterium tumefaciens) causes warty growths at the base and on roots. Remove and destroy affected material; do not replant forsythia in the same spot. Phytophthora root rot can cause sudden dieback in waterlogged soils.
Prevent weeping forsythia problems before they start
Most weeping forsythia issues are care-mismatch, not bad luck. Dial in the basics:
Looking for weeping forsythia in general rather than its problems? Read the full weeping forsythia care guide — light, water, soil and feeding.
weeping forsythia problems — FAQ
Why is my weeping forsythia failure to flower?
The most common cause is pruning in autumn or winter, removing the flowering wood formed on the previous season's growth. Prune only right after flowering finishes in spring.
Why is my weeping forsythia frost damage to buds?
In areas with late hard frosts, flower buds can be killed after swelling. Selecting a sheltered, south-facing wall position or applying fleece during sharp frost events can help protect buds.
Why is my weeping forsythia galls and dieback?
Crown gall (Agrobacterium tumefaciens) causes warty growths at the base and on roots. Remove and destroy affected material; do not replant forsythia in the same spot. Phytophthora root rot can cause sudden dieback in waterlogged soils.