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A. Flowering Characteristics
A. giganteum flowers in early summer (June/July)
and lasts 2-3 weeks. Plants are 35-50 inches tall
with a large umbel of densely clumped florets.
B. General Characteristics
1. Origin of species: Himalayas
2. Common names: Ornamental Onion
3. Geophyte organ: Tunicated bulb
4. Hardiness type: Hardy III - Injured below 5
degrees F (-15C) when planted.
5. Natural reproductive systems and growth and
development requirements: A. giganteum reproduces
by annual daughter bulb replacement and requires
a warm (77 to 82F) - cool (28 to 35F) - warm (55
to 65) annual thermoperiodic cycle.
6. Primary uses: Beds, fresh cut flowers, and
exhibition bulbs.
C. Cultural Information
1. Bulb sizes: 20/up cm, in circumference.
2. Planting density: 12 inches apart, 1 bulb per
sq. ft.
3. Planting depth: 8 inches to base of the bulb.
4. Planting time: Fall
5. Climatic zone habit: 1990 USDA Climatic Zone
3 with mulch, Zones 4 to 7 without mulch.
6. Light requirements: Full sunlight to PM only
sunlight.
7. Moisture: Tolerates summer drought. Keep moist
during growing season.
8. Animal susceptibility: Normally not susceptible.
D. Companion Plants:
Asiatic Hybrid lilies (white and yellow cvs.),
Centaurea dealbata, Coreopsis, Dianthus, Digitalis,
Gypsophila paniculata, Hemerocallis (yellow cvs.),
Iris (rhizomatous white and yellow cvs.), Kniphofia
(yellow cvs.), Peonies (white and yellow cvs.),
Verbascum (white cvs.), Rhododendron spp. (deciduous
and evergreen), Cotoneaster, Berberis, Acer palmatum,
Deutzia gracilis, Weigela.
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