Even though this is a member of the onion, garlic and leek family, large allium (Allium giganteum), also called flowering onion, is developed because of its big, lollipoplike clusters of lavender blooms. The softball-sized flowers seem in May or June along with long, strong stalks. The blooms, which offer shade between summer annuals and early-blooming bulbs, last about three months when they’re not exposed to strong winds. Allium is right for for planting in U.S. Department of Agriculture hardiness zones 6 to 10, and survives even cooler climates with adequate winter safety. Once proven, without any treatment is required by the crops.
Plant large allium bulbs in a area that receives sunlight in soil.
Water the planting location seriously, saturating the soil across the bulbs, soon after after planting. Once proven, large allium is drought-tolerant with no irrigation is needed.
Feed large allium at planting time to get off the bulbs into a start. Use a fertilizer formulated for bulbs, used in line with the instructions on the package label. No fertilizer is needed when the the large alliums are proven.
By pinching flowers as quickly as they wilt control allium. Permit the flowers to go to seed, in the event you want crops.
Subsequent to the foliage turns yellow in summer cut allium down to walk out. Avoid while it is still green, reducing the foliage, as the foliage that is dwelling gives the bulbs with power for the subsequent period that is blooming.
Spread 2 to 3″ of mulch on the planting area in autumn to safeguard the bulbs and maintain an even soil temperature. Use an organic mulch like chopped leaves, compost or pine bark. Remove the mulch following the last frost in spring.
Divide large allium every three to four years or when the crops start to appear blooming and over-crowded decreases. Lift the bulbs in the ground using a garden fork or spade. Pull the bulbs aside. Replant some of the bulbs, and plant the the remaining of the the large allium bulbs in an area that is new.