Black ironwood
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Krugiodendron ferreum
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Rhamnaceae
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Landscape Uses:
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An accent or specimen tree in residential and commercial landscapes, but slow growing and sometimes difficult to establish. |
Ecological Restoration Notes: |
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An important canopy or subcanopy tree in hammocks. |
Availability: |
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Widely cultivated. Available in Lake Worth at Indian Trails Native Nursery (561-641-9488), and in Key West at Key West Botanical Garden.
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Description: |
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Small to medium tree with slender branches. Trunk 4-10 inches in diameter, rarely more. Bark dark gray, rough, becoming furrowed and forming vertical ridges. Leaves attractive, bright glossy green above, 1-1 1/2 inches long. Unfolding leaves are pinkish. |
Height: |
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Typically 15-25 feet in height; to 33 feet in South Florida. Usually taller than broad. |
Growth Rate: |
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Slow to very slow. |
Range: |
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Monroe County Keys north mostly along east coast to Brevard County; West Indies, Mexico and Central America. For a digitized image of Elbert Little's Florida range map, visit the Exploring Florida website. |
Habitats: |
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Hammocks. |
Soils: |
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Moist, well-drained sandy or limestone soils, with humusy top layer. |
Nutritional Requirements: |
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Moderate to high; grows best with some organic content and may languish in nutrient poor soils. |
Salt Water Tolerance: |
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Low; does not tolerate long-term flooding by salt or brackish water. |
Salt Wind Tolerance: |
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Moderate; grows near salt water, but is protected from direct salt spray by other vegetation. |
Drought Tolerance: |
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High; does not require any supplemental water once established. |
Light Requirements: |
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Full sun to light shade. |
Flower Color: |
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Greenish. |
Flower Characteristics: |
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Inconspicuous, but the small flowers secrete copious amounts of nectar. |
Flowering Season: |
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All year; peak late spring to late summer. |
Fruit: |
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Oval or nearly round, 1/3" long drupe, ripening black. Mostly maturing summer to fall. Edible; sweet. |
Wildlife and Ecology: |
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Provides moderate amounts of food and significant cover for wildlife. Birds and other animals eat the fruits. |
Horticultural Notes: |
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Can be grown from seed. Clean and plant right away; seed does not store well. Place container in light shade. |
Comments: |
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The wood is hard, the densest of all woods native to South Florida; it will sink in water. |
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George D. Gann in habitat, Dominican Republic, 2011
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