Goliath Ornamental Onion
Allium altissimum 'Goliath'
Goliath Ornamental Onion flowers
(Photo courtesy of NetPS Plant Finder)
Plant Height: 24 inches
Flower Height: 6 feet
Spread: 24 inches
Hardiness Zone: 4
Other Names: Flowering Onion
Striking 5 inch lilac-pink globe flowers emerge from thick strappy green foliage; attracts butterflies; plant close together for a massed effect or plant futher apart among lower growing plants
Goliath Ornamental Onion features bold balls of lightly-scented lilac purple flowers at the ends of the stems from late spring to early summer. The flowers are excellent for cutting. Its fragrant sword-like leaves remain green in color throughout the season. The fruit is not ornamentally significant.
Goliath Ornamental Onion is an open herbaceous perennial with tall flower stalks held atop a low mound of foliage. Its wonderfully bold, coarse texture can be very effective in a balanced garden composition.
This is a relatively low maintenance plant, and should only be pruned after flowering to avoid removing any of the current season's flowers. It is a good choice for attracting butterflies to your yard, but is not particularly attractive to deer who tend to leave it alone in favor of tastier treats. It has no significant negative characteristics.
Goliath Ornamental Onion is recommended for the following landscape applications;
- Vertical Accent
- Mass Planting
- General Garden Use
Planting & Growing
Goliath Ornamental Onion will grow to be about 24 inches tall at maturity extending to 6 feet tall with the flowers, with a spread of 24 inches. It grows at a medium rate, and under ideal conditions can be expected to live for approximately 5 years. As this plant tends to go dormant in summer, it is best interplanted with late-season bloomers to hide the dying foliage.
This plant should only be grown in full sunlight. It does best in average to evenly moist conditions, but will not tolerate standing water. It is not particular as to soil type or pH, and is able to handle environmental salt. It is highly tolerant of urban pollution and will even thrive in inner city environments. This is a selected variety of a species not originally from North America. It can be propagated by multiplication of the underground bulbs; however, as a cultivated variety, be aware that it may be subject to certain restrictions or prohibitions on propagation.