Bigleaf Hydrangea (Hydrangea macrophylla 'Lanarth White')
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Detailed Information
Bigleaf Hydrangea (Hydrangea macrophylla), in general, is native to **Japan**.
The cultivar ‘Lanarth White’ specifically was developed in **Lanarth, Cornwall, England**. So while the *species* originated in Japan, this particular variety was bred in England.
Therefore, the answer depends on what you’re asking:
* **Species (Hydrangea macrophylla):** Japan
* **Cultivar (‘Lanarth White’):** Developed in England (but ultimately derived from a Japanese species)
Most people would associate its origin with **Japan**.