Giant Allium Globemaster Bulbs Plant Facts

Author: burtchris7,

Published On: September 7, 2023

Giant Allium Globemaster Bulbs are a striking and majestic variety of ornamental onion known for their impressive spherical flower heads. These bulbs produce enormous, globe-shaped blooms that can reach up to 8-10 inches in diameter. Each flower head is composed of hundreds of tiny star-shaped florets, creating a visually stunning display. The rich purple coloration of the blooms provides a vibrant and captivating focal point in any garden. The sturdy stems rise above the foliage, adding a vertical dimension to the landscape.

Planting Zone Information: Giant Allium Globemaster Bulbs are best suited for USDA Hardiness Zones 4-9. They thrive in areas with cold winters and warm summers.

Growing Guide:

  1. Selecting a Planting Location:
    • Choose a site with well-draining soil. Alliums prefer a location that receives full sun to partial shade.
  2. Timing:
    • Plant bulbs in the fall, ideally 4-6 weeks before the first hard frost. This allows them to establish their root systems before winter.
  3. Preparing the Soil:
    • Ensure the soil is well-draining, as Alliums dislike waterlogged conditions. You may amend heavy clay soils with organic matter to improve drainage.
  4. Planting Depth:
    • Dig a hole that is about 3 times the height of the bulb. For Giant Allium Globemaster Bulbs, this generally means placing them about 6-8 inches deep.
  5. Spacing:
    • Space the bulbs approximately 8-12 inches apart to allow for proper air circulation and to accommodate their impressive size.
  6. Positioning:
    • Place the bulb in the hole with the pointed end facing upwards. The flatter end is the root side. Cover with soil, pressing gently to eliminate air pockets.
  7. Watering:
    • Give the newly planted bulbs a thorough watering to settle the soil around them. Ensure the soil remains consistently moist but not waterlogged.
  8. Mulching:
    • Apply a layer of organic mulch, such as straw or shredded bark, to help retain moisture and regulate soil temperature.
  9. Fertilizing:
    • Alliums are not heavy feeders, but you can apply a balanced, slow-release fertilizer in the spring when new growth emerges.
  10. Maintenance:
    • Remove any spent flowers to encourage the plant to focus its energy on bulb development. Allow the foliage to die back naturally after blooming.
  11. Overwintering:
    • In areas with harsh winters, apply a layer of mulch over the planting area to protect the bulbs from extreme cold.
  12. Dividing Bulbs:
    • Alliums typically do not require dividing for several years. When overcrowding becomes evident, lift and divide the bulbs in the fall.

Additional Tips:

  • Alliums are generally resistant to pests and diseases, making them low-maintenance additions to the garden.
  • Giant Allium Globemaster Bulbs can also be grown successfully in containers filled with well-draining potting mix.

With proper care and attention, Giant Allium Globemaster Bulbs will reward you with stunning, eye-catching blooms that are sure to be a highlight in your garden.