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A. Flowering Characteristics
Hyacinthus orientalis flowers in mid-spring (April/May)
for 2-3 weeks. Plants are 8-12 inches tall.
B. General Characteristics
1. Origin of species: Mediterranean
2. Common names: Dutch Hyacinths
3. Geophyte organ: Tunicated bulb
4. Hardiness type: Hardy I - Injured at temperatures
below 23 degrees F (-5C) when planted.
5. Natural reproductive systems and growth and
development requirements: Reproduces slowly by
offsets and requires a warm (70 to 80F) - cool
(32 to 35F) - warm (50 to 65F) annual thermoperiodic
cycle.
6. Primary uses: Beds, borders, and rock gardens.
C. Cultural Information
1. Bulb sizes: 13/14, 14/15, 15/16, 16/17,17/18,
18/up in cm, in circumference.
2. Planting density: 1-3 inches apart, 6 to 9
bulbs per sq. ft.
3. Planting depth: 8 inches to base of the bulb.
4. Planting time: Fall
5. Perennialization habit: 1990 USDA Climatic
Zone 4 with mulch, 5 to 7 without mulch.
6. Light requirements: Full sunlight, to PM only
or AM only sunlight.
7. Moisture: Tolerates (prefers) summer drought,
but should be kept moist during growing season.
8. Animal susceptibility: Generally not susceptible.
D. Companion Plants:
Alyssum, Arabis, Campanula, Centaurea dealbata,
Coreopsis, Dianthus, Digitalis, Hemerocallis,
Rhododendron spp. (deciduous and evergreen), Cotoneaster,
Berberis, Acer palmatum, Deutzia gracilis, Weigela.
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