For a little ( immediate) winter silver colour, how about some Cineraria's dotted about, @TheGardenerFromMars ? Mine are doing wonderfully well at the moment and looking great.
Or a Calocephalus ( cushion bush/sliver thread) plant?
Pete 8, a great list but the Gardener from Mars wants blue/silver foliage, not flowers, guessing its to form a nice contrast with the red soil!!!
oops - Oh well - for future reference then maybe..
Festuca glauca Iris have bluey spiky leaves A neighbour has the Astelia that KOG mentions - it does look really good when the sun hits it at the right angle - it looks like silvery green steel. Juniperus squamata Blue Star - slow growing but does eventually get big, but can be trimmed to size
Billericay - Essex
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
If the drainage is good then in the sunny areas of the beds maybe convolvulus cneorum, lamb's ear plant, cotton lavender, perovskia, curry plant, Salvia officinalis or some of the lavender varieties might work and in the parts that are more shaded there are variegated varieties of Brunnera like Jack Frost that might be more suited.
Depending on the space available, and how much shade, you could have a go with Melianthus major (prefers sun, large but impressive foliage) or blue-leaved hostas (which are a bit better in part sun than many green or yellow varieties anyway). The scallopy foliage of Macleayas is greyish. But the point about grey foliage is that it loses water less easily than green, so you need to check that it’s not too moist and shady for most of these. Others have given excellent suggestions. I like Pachypoda ‘Misty Blue’ in particular. Try the website at Longacre Plants for shade ideas.
Caryopteris White Surprise. The leaves are a pale green edged white with tufts of lovely blue flowers. It is deciduous. Like sun/ partial shade, well drained soil.
I was going to suggest Caryopteris too, but Sterling Silver, a recent acquisition of mine that currently lives under the near full shade of a fig tree, although it said full sun on the label. It has lovely silver foliage and steely lavender blue flowers from September onwards, so good for late season interest.
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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Or a Calocephalus ( cushion bush/sliver thread) plant?
Festuca glauca
Iris have bluey spiky leaves
A neighbour has the Astelia that KOG mentions - it does look really good when the sun hits it at the right angle - it looks like silvery green steel.
Juniperus squamata Blue Star - slow growing but does eventually get big, but can be trimmed to size
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.