Another the silver foliage plants I added was Stachys byzantina. I brought in some cuttings from my allotment where they had been originally planted by a predecessor and had rapidly become established. It is the furriness of their leaves that gets them their name of lamb’s ears or less poetically woolly hedge nettle. They multiply easily and can be a bit scruffy but their flowers are attractive to bees & other pollinators so I am inclined to let them spread..
I keep a corner of them on the south corner as well as in the oak tree’s pot.