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- ORNITHOGALUM umbellatum (White flowers) A. Flowering Characteristics Ornithogalum umbellatum flowers in late spring (May) for 3-4 weeks and plants are 4-6 inches tall. B. General Characteristics 1. Origin of species: Asia Minor, Europe and North America 2. Common names: Star of Bethlehem 3. Geophyte organ: Tunicated bulb 4. Hardiness type: Hardy III 5. Natural reproductive systems and growth and development requirements: Reproduces readily by seed and bulblets and requires a warm (60 to 70F) - cool (28 to 32F) - warm (55 to 65F) annual thermoperiodic cycle. 6. Primary uses: Beds, borders, ground covers, rock gardens, and woodland gardens. C. Cultural Information 1. Bulb sizes: 4/5, 5/6, 6/up cm, in circumference 2. Planting density: 2-3 inches apart, 20-25 per sq. ft. 3. Planting depth: 5 inches to base of bulb 4. Planting time: Fall 5. Perennialization habit: 1990 USDA Climatic Zones 2 3 4 5 6 7 8 9 10 11 - M P P P P P - - - 6. Light requirements: Sunlight Full PM AM Shade (light reduction) only only 25% 50% XXXXXXXXXXXXXXXX 7. Moisture: Tolerates summer drought, but requires moisture during growing season. 8. Animal susceptibility: Generally, not susceptible. D. Companion Plants: Anemone pulsatilla, Anemone sylvestris, Aquilegia, Chaenomeles japonica, Dicentra, ferns, Forsythia, Helleborus orientalis, Hosta, Jasminum nudiflorum, Myosotis, Primula, Phlox divaricata, Phlox stoloniferan, Rhododendron spp. (deciduous and evergreen), Cotoneaster, Berberis, Acer palmatum, Deutzia gracilis, Weigela.
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