Sedums are pretty boring most of the year but they do have the double advantage of being able to survive a drought and flowering in autumn. They like stoney ground and tolerate heat. The usual type has wide flower heads that start white and turn a hot pink, but there are lots of different onces - tall, short, green leaved, red leaved... unfortunately the varieties are difficult to find in Umbria so some Brits are considering sneaking a few plants over in their hand luggage. Beth Chatto has a fantastic range but doesn't mail plants outside UK. I tend to mix Sedums in with other 'piante grasse' which are more or less happy without water but have very interesting shaped leaves and flower at different times but don't always survive the cold winter.