Both their long, elegant leaves, and bright flowers make a great, hardy border, and they are good at camouflaging unattractive areas, too. Plant Care Tips USDA Growing Zones: 3 to 9.

If you would like to do an all-blue flower border, here are some plants you should definitely consider using. Hardy geraniums: “Johnson’s Blue” is an old favourite but “Rozanne” is a ...

Notably, blue agapanthus includes dark blue Midnight Star and Loch Hope, both 1-1.5m and hardy – although a covering of mulch for border examples and extra protection for potted ones in cold ...