Pond salvia

My pond salvia has been incredibly resilient and only blackened a little bit during the freezing cold spell - in today's sunshine, it's even showing signs of recovery!

It was given to me by a gardener friend 3 years ago. It bears bicoloured flowers (purple and white) and I think the variety is 'Amethyst Lips'. It's such a good doer and has done well in both dry and wet weather. Don't we all love plants like that!