During late spring, the Flowering Nodding Onion produces many heads of nodding florets in an exquisite amethyst-purple shade. As these fade, a very decorative seed head is revealed. An excellent hardy perennial in zones 5-9. From a family of more than 700 species mostly originating from dry and mountainous regions in the northern hemisphere, Alliums are closely related to the onion. This can be detected by their characteristic, pungent aroma. Popular in Victorian times, these ornamental onions are surprisingly at home in the flower border. ABOUT THE ROYAL BOTANIC GARDENS, KEW: Kew grows more species in its 300 acres than any garden in the world and is an important scientific institution. The magnificent glasshouses, including Decimus Burton's famous Palm House, display a wide range of plants from rainforest to desert and provide the visitor with a visual and fragrant treat whatever the time of year.