Heirloom Herb. Borage seeds produce loads of pretty blue flowers that help to attract beneficial bees to your garden. Plants grow to 50 cm (20″) tall in the garden. We believe that borage is often overlooked and definitely underused in the garden, as it makes an outstanding ornamental plant. Flowers are used as a garnish for salads or are candied, while the leaves are used to flavour claret punch. Borage may establish itself in the garden by self-sowing or by animals distributing the seeds. While it is adventive, borage is not invasive. Annual.