Buy Agapanthus 'Navy Blue' from Sarah Raven: With their strong stems and beautiful large heads, agapanthus make a structural and graceful addition to any border. Agapanthus 'Navy Blue' has the deepest-blue bells on blue-black stems.
Buddleja 'Buzz™ Sky Blue' - dwarf patio Buddleia in a pot. Buddleia davidii ‘Buzz Sky Blue’ should keep flowering until September or October. It has flowers the same size as usual Buddleia but only grows to