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).
Rock Garden Ideas. On top of the “hidden” in-ground infiltration system, the river-rock is interspersed with Agave americana ‘Varietgata’ and ‘Icee Blue’ spreading juniper (Juniperus horizontalis ‘Icee Blue’).