Agapanthus, also known as 'African Lillies' are clump-forming perennials which are a stunning addition to any garden! Its tall flowers are stunning at the back of a herbaceous border.
Agastache are herbaceous perennials which are commonly known as Giant Hyssop. They are perfect for adding colour and vertical dimension to any landscape.
'Italian Bugloss' is a biennial or short-lived perennial however, do not let this put you off. It is still a magnificent plant with stunning flowers and structural integrity.