Keep it watered and be patient. Mine is a cutting from the one I had in my last garden. Planted it near the then pond edge in January and it's been under water ever since and is currently covered in healthy foliage.
Vendée - 20kms from Atlantic coast. "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
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"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw