Using stone and rocks to edge your beds gives a timeless beauty to your borders. It's a relatively expensive option, unless you can source the rocks on your property, but it's durable and unlikely to go out of style. Boulders and pebbles are suited to natural gardens with informal, curving boders (shown).
Sedum ‘Angelina’ - I have Sedum ‘Angelina’ all over my yard…. It grows in sun or shade, with moist soil or dry, and spreads like crazy. It even plants itself from broken stems that blow around the yard! It’s a gorgeous yellow green, and gets yellow flowers in early summer, but they aren’t really attractive to bees. Works in beds, containers, or between pavers. It is semi evergreen, and gets a cool bronzy tip in the winter. Love. This. Plant.