Troubleshooting
Bigleaf Hydrangea 'Nikko Blue' problems — and how to fix them
Bigleaf 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 pruning
Blooms on old wood; pruning in autumn, winter or spring removes the flower buds. Prune only right after flowering, removing spent heads to the next strong buds.
Wilting in heat
Big soft leaves wilt fast in sun and drought; site in afternoon shade, mulch heavily and water deeply during hot spells.
Wrong flower colour
Blue needs acidic soil with free aluminium; in neutral or limy soil it turns pink or muddy. Acidify with sulphur/aluminium sulphate to hold blue.
Frost-killed buds
Late frosts kill the exposed old-wood buds, giving a flowerless year; plant in a sheltered spot and leave old growth on over winter for protection.
Prevent bigleaf hydrangea 'nikko blue' problems before they start
Most bigleaf hydrangea 'nikko blue' issues are care-mismatch, not bad luck. Dial in the basics:
- Common hydrangea problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Bigleaf Hydrangea 'Nikko Blue' watering schedule
- Bigleaf Hydrangea 'Nikko Blue' light requirements
- Best soil mix for bigleaf hydrangea 'nikko blue'
- Bigleaf Hydrangea 'Nikko Blue' temperature & humidity
- Full bigleaf hydrangea 'nikko blue' care guide
Looking for bigleaf hydrangea 'nikko blue' in general rather than its problems? Read the full bigleaf hydrangea 'nikko blue' care guide — light, water, soil and feeding.
Bigleaf Hydrangea 'Nikko Blue' problems — FAQ
Why is my bigleaf hydrangea 'nikko blue' no flowers after pruning?
Blooms on old wood; pruning in autumn, winter or spring removes the flower buds. Prune only right after flowering, removing spent heads to the next strong buds.
Why is my bigleaf hydrangea 'nikko blue' wilting in heat?
Big soft leaves wilt fast in sun and drought; site in afternoon shade, mulch heavily and water deeply during hot spells.
Why is my bigleaf hydrangea 'nikko blue' wrong flower colour?
Blue needs acidic soil with free aluminium; in neutral or limy soil it turns pink or muddy. Acidify with sulphur/aluminium sulphate to hold blue.
Why is my bigleaf hydrangea 'nikko blue' frost-killed buds?
Late frosts kill the exposed old-wood buds, giving a flowerless year; plant in a sheltered spot and leave old growth on over winter for protection.