Salvia x sylvestris 'May Knight'

Ask the Expert: What is this?
This flowering plant is currently planted in central Pennsylvania and is about 18-20' tall. What is it? :)
Thanks,
~Karen

Reply:

You have a beautiful specimen of a perennial from the salvia family.  The plants name is Salvia x slyvestris 'May Knight' or May Knight Salvia.  It is a wonderful plant and the butterflies and bees love it.  Although I have a pretty one in my garden, it is not nearly as beautiful as yours.

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