Troubleshooting
Hydrangea 'Nikko Blue' problems — and how to fix them
Hydrangea 'Nikko Blue' (Hydrangea macrophylla 'Nikko Blue') 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.
No flowers after winter
Frost damage to old wood buds is the main cause; protect buds from late frosts with fleece and avoid pruning in autumn or spring.
Flowers turning green or fading
Normal ageing process in summer heat; cut back faded heads after flowering to encourage fresh growth.
Pink flowers when blue expected
Soil pH too high; lower with aluminium sulphate or switch to ericaceous container growing.
Leaf scorch
Brown leaf edges caused by drought stress or excessive sun; water more consistently and provide afternoon shade.
Botrytis (grey mould)
In cool, wet conditions on dying blooms or foliage; remove affected material promptly and improve air circulation.
Prevent hydrangea 'nikko blue' problems before they start
Most hydrangea 'nikko blue' issues are care-mismatch, not bad luck. Dial in the basics:
Hydrangea 'Nikko Blue' problems — FAQ
Why is my hydrangea 'nikko blue' no flowers after winter?
Frost damage to old wood buds is the main cause; protect buds from late frosts with fleece and avoid pruning in autumn or spring.
Why is my hydrangea 'nikko blue' flowers turning green or fading?
Normal ageing process in summer heat; cut back faded heads after flowering to encourage fresh growth.
Why is my hydrangea 'nikko blue' pink flowers when blue expected?
Soil pH too high; lower with aluminium sulphate or switch to ericaceous container growing.
Why is my hydrangea 'nikko blue' leaf scorch?
Brown leaf edges caused by drought stress or excessive sun; water more consistently and provide afternoon shade.
Why is my hydrangea 'nikko blue' botrytis (grey mould)?
In cool, wet conditions on dying blooms or foliage; remove affected material promptly and improve air circulation.