Your best approach is to plant your. It’s during these months that the soil temperature is ideal for the bulbs to establish roots and prepare for winter dormancy. Consider your local climate and rainfall patterns when deciding on the best planting time, and be sure to provide well-draining soil for your bulbs to thrive. September, october, and november are prime for planting, while december and january are best for warmer climates. In summary, the ideal time to plant allium bulbs is in the fall or early summer , before the first frost of the season. ‘allium bulbs should be planted in fall – once air and soil temperatures have cooled - for early spring bloom,’ says adelle hack from white flower farm. · i’ve found through experience that these hardy bulbs are best planted in the fall , ensuring a vibrant display in the late spring or early summer. Space bulbs two to three times their height and mix different varieties for color. · plant allium bulbs in the fall when soil temperatures reach about 50 degrees fahrenheit. Depending on your growing zone, the ideal month to plant them is between september to november; · fall is the best time to plant ornamental alliums. · all bulbs that are planted in the early to mid autumn should bloom come the spring, but take note that the later the planting, the later that first flowering. You want to plant allium bulbs after the first frost but before the ground freezes. · best grown in usda hardiness zones 3-8, alliums are best planted from september through to late october. Tuck them in as you plant other spring-flowering bulbs like daffodils and tulips and await the spring display. Give alliums full sun, well-draining soil, and light watering until dormancy to keep bulbs healthy. · autumn is the best time to plant allium bulbs.