Ornamental Onion
Many Allium species and hybrids are cultivated as ornamentals. These include A. cristophii and A. giganteum, which are used as border plants for their ornamental flowers, and their "architectural" qualities.Several hybrids have been bred, or selected, with rich purple flowers. A. hollandicum 'Purple Sensation' is one of the most popular and has been given an Award of Garden Merit (H4).These ornamental onions produce spherical umbels on single stalks in spring and summer, in a wide variety of sizes and colours, ranging from white (Allium 'Mont Blanc'), blue (A. caeruleum), to yellow (A. flavum) and purple (A. giganteum). By contrast, other species (such as invasive A. triquetrum and A. ursinum) can become troublesome garden weeds.
The following cultivars, of uncertain or mixed parentage, have gained the Royal Horticultural Society’s Award of Garden Merit:
- ’Ambassador’
- ’Beau Regard’
- ’Gladiator’
- ’Globemaster’
- ’Round and Purple’
https://en.wikipedia.org/wiki/Allium
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