Growth Rate
Moderate: Ornamental Onions have a moderate growth rate. They typically establish themselves within a year or two and then return reliably each spring.
Size
Height: Depending on the variety, Ornamental Onions can range from 1 to 4 feet in height.
Spread: The spread of these plants usually ranges from 6 inches to 1 foot.
Growing Conditions
Sunlight: Prefers full sun but can tolerate partial shade.
Soil: Thrives in well-drained soil. They do not do well in waterlogged conditions.
Watering: Requires regular watering, especially during the growing season, but can tolerate some drought once established.
Hardiness Zones: Suitable for USDA hardiness zones 4-9, depending on the variety.