P. cordifolium

My P. cordifolium is planted in the garden in full sun and is approximately 2
feet tall now.  We have been having a hot spell of weather (and more humid
than we usually have) and the leaves are all curling inwards so that the silvery
underside is all that shows.  I thought the plant needed more water, so I
watered it deeply but the leaves have not uncurled.  The leaves are not dropping,
and are not brown or crispy.

Can anyone tell me what is happening?

Thanks,

Cindi
San Diego, CA
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