When to Plant
Delivery & Planting Times
Spring-flowering bulbs must be planted in the fall. They need cool soil to make roots before the onset of winter. Cool fall weather arrives at different times from north to south and from high elevations to low.
Please note that the temperature of the soil lags behind the air temperature. You can generally plant later than the windows provided in this map. As long as the ground is not frozen, you can still plant.
“Nigrum” is Latin for “black,” and yet this allium has white flowers. They are arranged in hemispheres 4 inches across. Borne on slender stems, they float like small clouds over the garden. Bloom follows that of Mount Everest.
Note: Alliums are resistant to deer, but rodents such as voles and gophers may eat the bulbs.
|Sunlight||Full (6+ hours sun per day)|
Bulb size is determined by the circumference around the largest part of the bulb. Colorblends only delivers top size bulbs. Large bulbs produce more or larger flowers than small bulbs.
Hardy in USDA zones 4a to 7b in the South or 10b on the West Coast.
|Bloom Time||Very Late|
Plant in full sun or light shade and well-drained soil. Sandy soil is ideal. Allium leaves begin to yellow by the time the flowers open. You can disguise the foliage by planting large alliums behind or among bushy perennials or shrubs, and small alliums among low-growing perennials. The flower heads of Globemaster and Christophii remain attractive for a time even after the color drains away. They can be left in the garden or cut and dried for use in indoor arrangements.
|Depth of Planting Hole||5 inches|
|Spacing||5 inches apart|