- neapolitanum (White flowers)
- A. Flowering Characteristics
- A. neapolitanum flowers in spring (May/June) and
lasts 2-3 weeks. Plants are 15 inches tall with a loose umbel of white
- B. General Characteristics
- 1. Origin of species: Northern Africa and Southern Europe
- 2. Common names: Ornamental Onion
- 3. Geophyte organ: Tunicated bulb
- 4. Hardiness type: Tender III - Injured at temperatures
below 35 degrees F (2C) when planted.
- 5. Natural reproductive systems and growth and development
requirements: A. neapolitanum reproduces by annual daughter bulb
replacement and requires a warm (68 to 73F) - cool (35 to 50F) - warm (55
to 65F) annual thermoperiodic cycle.
- 6. Primary uses: Borders, rock gardens, woodland gardens,
and ground covers.
- C. Cultural Information
- 1. Bulb sizes: 4/up cm, in circumference.
- 2. Planting density: 4 inches apart, 9 bulbs per sq.
- 3. Planting depth: 5 inches to base of the bulb.
- 4. Planting time: Fall
- 5. Climatic zone habit: 1990 USDA Climatic Zone 7 with
mulch, Zones 8 to 10 without mulch.
- 6. Light requirements: Full sunlight only.
- 7. Moisture: Tolerates summer drought, but keep moist
during growing season.
- 8. Animal susceptibility: Normally not susceptible.
- D. Companion Plants:
- Alyssum, Arabis, Aster, Crocosmia, Dryopteris erythrosora,Coreopsis,Digitalis,
Hemerocallis, Hosta, Iris (rhizomatous), Kniphofia, Sedum, Stokesia,
Zantedeschia, Berberis, Deutzia gracilis, Pittosporum, Rhododendron spp.,
Spiraea spp., Weigela.
Holland Technical Service Bulletin Number 31 was prepared for the WWW system
by A.A. De Hertogh, L.B. Gallitano, M.E. Traer, and A.B. Russell, Department
of Horticultural Science, NC State University. The information was obtained
not only from original research conducted by the authors but also from databases
released by other sources. This Bulletin was published by the International
Flower Bulb Center (IBC), Hillegom, the Netherlands on behalf of the Dutch Flower
Bulb Industry. Because of the various climates in North America and year-to-year
variability of the weather, the IBC cannot and does not accept responsibility
for divergent results that may arise using information obtained from this document
or site. Photographs copyright @1997 by A.B. Russell and A.A. De Hertogh. Computer
programming by Miguel Buendia, graphics by Brad Capel.