Interesting Information About Plant:
The Black Locust is native to the Eastern United States. It was brought to the Western United States (California) by gold miners, who grew the plant for mining timbers. Once in California, it was planted because the wood made excellent railroad timbers. Black Locust was later brought overseas to France in the 1600’s. In France the wood was used for shipbuilding, the flowers were used in cooking, and the fruit was used as a coffee substitute.
Black Locust is a very hardy and competitive plant. It adapts well to a variety of soils and can survive droughts and harsh winters. It reproduces by root suckering and stump sprouting to form clones, which are all connected by a fibrous root system. Because of this, Black Locust can be hard to control. Even though it grows very fast (it can reach heights of 50-100 feet), it rarely lives to be 100 years old.
The Black Locust inner bark, roots, and twigs are poisonous to livestock, especially horses, and can be fatal. The seed is poisonous to humans.
Today the Black Locust is primarily used to stop soil erosion and it is also important in bee keeping. It is often planted near hives so the bees can get nectar from flowers and make honey. The wood is also important, and it is used in shipbuilding (yachts), furniture, and fence posts.
As mentioned earlier, the Black Locust is a very hardy plant, but it is susceptible to damage from two native insects: the locust borer and the locust leaf miner. The Locust Borer only attacks the Black Locust. It tunnels into the trees trunk and branches and weakens the tree, making it susceptible to wind damage.
Common Name: Black Locust
Scientific Name: Robinia pseudoacacia
Family Name (Scientific and Common): Fabaceae (Pea Family)
Continent of Origin: Southeastern United States
Most Distinguishing Morphological Features of This Plant: The leaves of the Black Locust are composed of 7-20 leaflets, which are oval and rounded and slightly pointed at the ends. The leaflets themselves are not that big (1/2-2 inches long). At nighttime, the leaflets fold up and droop. Because of all the leaflets, the Black Locust has a feathery appearance.
Plant Growth Habit: Large Tree
Height at Maturity: More than 10 Feet
Life Span: Perennial
Seasonal Habit: Deciduous Perennial
Growth Habitat: Full Sun
Manner of Culture: Native Species
Thorns on Younger Stem?: Yes
Cross Section of Younger Stem: Roundish
Stem (or Trunk) Diameter: More Than The Diameter of a Coffee-Mug
Produces Brownish Bark?: Yes
Bark Peeling in Many Areas?: No
Characteristics of Mature (Brownish) Bark: Lines Go Up-Down
Type of Leaf: Flat, Thin Leaf
Length of Leaf (or Leaflet): Less than Length of a Credit Card
Leaf Complexity: Pinnately Compound
Shape of Leaf: Pinnately-Lobed
Edge of Leaf?: Smooth
Leaf Arrangement: Alternate
Leaf has Petiole?: Yes
Patterns of Main-Veins: Pinnate
Leaf Hairiness: No Hairs
Color of Foliage in Summer: Green
Change in Color of Foliage in October: No Change
Flowering Season: Spring
Flowers: in Loose Group
Type of Flower: Colorful Flower
Color of Flower: White
Shape of Individual Flower: Bilaterally Symmetrical
Size of Individual Flower: Between a Quarter and the Length of a Credit Card
Sexuality: Hermaphroditic Flower
Size of Fruit: Between a Quarter and the Length of a Credit Card
Fruit Fleshiness at Maturity?: Dry
Shape of Fruit: Long Pod
Color of Fruit at Maturity: Brown or Dry
Fruit Desirable to Birds or Squirrels?: Yes
Unique Morphological Features of Plant: The numerous leaflets and their small size gives the tree a feathery appearance.
Is the Plant Poisonous: Part of Plant
Pesty Plant (weedy, hard to control)?: Yes
Common Name(s): Common Locust, Yellow or White Locust
Louisville Plants That Are Most Easily Confused With This One: None—no other plants in Louisville are commonly confused with it
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