General Plant Information (Edit)
Plant Habit: Tree
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: Mesic
Dry Mesic
Dry
Soil pH Preferences: Strongly acid (5.1 – 5.5)
Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
Maximum recommended zone: Zone 8b
Plant Height: 30 to 50 feet
Plant Spread: 20 to 35 feet
Leaves: Deciduous
Fruit: Other: 4 to5 inch long flat, purplish-brown pods
Fruiting Time: Late summer or early fall
Fall
Late fall or early winter
Winter
Flowers: Showy
Fragrant
Flower Color: White
Bloom Size: 1"-2"
Flower Time: Spring
Late spring or early summer
Underground structures: Taproot
Suitable Locations: Street Tree
Uses: Will Naturalize
Dynamic Accumulator: Nitrogen fixer
K (Potassium)
Ca (Calcium)
Wildlife Attractant: Bees
Resistances: Deer Resistant
Pollution
Drought tolerant
Pollinators: Bees
Miscellaneous: Tolerates poor soil
With thorns/spines/prickles/teeth
Monoecious
Conservation status: Least Concern (LC)

Conservation status:
Conservation status: Least Concern
Image
Common names
  • Black Locust
  • Yellow False Acacia
  • Yellow Locust
  • Post Locust
  • Common Locust

Photo Gallery
Location: Southern Pines, NC (northwest Broad street)
Date: April 2, 2024
Black locust #205; RAB p. 621, 98-32-1; AG p. 134, 32-19-1; LHB p
Location: Southern Pines, NC (U.S. 1 service road)
Date: May 14, 2023
Black locust #205; RAB p. 621, 98-32-1; AG p. 134, 32-19-1; LHB p
Location: Heathcote ON Canada
Date: 2018-08-9
Robinia pseudoacacia colourful seedpods
Location: Bois de Vincennes - Paris
Date: 2023-09-25
Location: Southern Pines, NC
Date: April 2, 2024
Black locust #205; RAB p. 621, 98-32-1; AG p. 134, 32-19-1; LHB p
Location: Funchal - Madeira
Date: 2023-04-18
Location: Southern Pines, NC (NW Broad Street)
Date: April 2, 2024
Black locust #205; RAB p. 621, 98-32-1; AG p. 134, 32-19-1; LHB p
Location: City Creek Canyon, Salt Lake City, Utah, United States
Date: 2023-05-28
Location: Middle Tennessee
Date: 2014-05-04
Location: Funchal - Madeira
Date: 2023-04-18
Location: Hiking Trail In Fairfax :-)
Location: Rehoboth Beach, Delaware
Date: 2017-05-02
white flower clusters
Location: Indiana  Zone 5
Date: 2009-05-23
flowers have a strong sweet sent
Location: Home
Date: 2016-09-11
Location: So calif
Date: 2018-04-18
Location: Funchal - Madeira
Date: 2023-04-18
Location: Royal Botanic Gardens, Kew
Date: 2017-10-09
Location: Gent, Belgium
Date: 2014-05-05
Location: Southern Pines, NC
Date: June 5, 2022
Black locust #205; RAB p. 621, 98-32-1; AG p. 134, 32-19-1; LHB p

Date: c. 1865
illustration by Bessa from Michaux's 'The North American Sylva',
Photo by SongofJoy
Photo by Tree_climber
Photo by Tree_climber
Photo by Mizshelli
Photo by Mizshelli
Photo by Mizshelli
Location: Downingtown, Pennsylvania
Date: 2010-07-11
tree in summer
Location: Rehoboth Beach, Delaware
Date: 2017-05-02
upright tree in bloom

Date: 2012-12-14

Date: 2012-12-14

Date: 2012-12-14
Location: Home
Date: 2016-09-11
Location: Home
Location: Home
Date: 2016-09-11
Location: central Illinois
Date: 2018-05-16
Location: Middle Tennessee
Date: 2014-05-04
Location: So calif
Date: 2018-04-18

credit: Olybrius
Location: So calif
Date: 2018-04-18
Location: Laurel Falls Trail, Smoky Mountains National Park
Date: 2017-04-25
Location: Laurel Falls Trail, Smoky Mountains National Park
Date: 2017-05-02
This plant is tagged in:
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Comments:
  • Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Jan 20, 2018 9:17 PM concerning plant:
    The Black Locust grows in its native range in open upland sites in two regions: the Appalachian Region from central Pennsylvania and southern Ohio down to northern Georgia & Alabama and the Ozark Region of southern Missouri, Arkansas, and east Oklahoma. However, mankind has spread it all around the South, the Midwest, the Mid-Atlantic, and the Northeast of the US. I think I saw some running around wild in southern Germany in 1981. It often is a weed tree, growing in abandoned lots, alleys, and waste places. It is fast growing of 2 to 3 feet/year and lives about 50 to 100 years. The fragrant white pea-like flowers are nice. The rest of the tree is not ornamental. It is weak-wooded and very messy by dropping lots of twigs, branches, and brown, woody, legume pods; and it can form a colony from prolific root suckering. I don't recommend it for landscaping and I don't know of any nurseries that sell any. It is considered as a non-native invasive plant in many states where it is not in its original native range. I don't mind some wild trees around, but not too many. It is good for reclaiming and stabilizing land where there were coal mines and it does fix nitrogen into the soil.
  • Posted by gardengus (Indiana Zone 5b) on Dec 23, 2021 6:08 PM concerning plant:
    Locust trees, including the black locust, make an excellent fence post and in the past were recommended for planting as an income source. The wood is fast growing, nitrogen fixing, and very naturally rot resistant. Reported to give 20-25 years as outdoor posts for burning. The wood has a high BTU and the spring blossoms smell great and are loved by bees.
  • Posted by Permastake (Toronto Ontario Canada - Zone 4b) on Aug 19, 2023 3:18 PM concerning plant:
    I wish someone had warned me about planting this very thorny invasive tree. (Nursery where I bought it?)
    So hard to get rid of. Roots so easily from the many seedpods Don't ever plant it.
Plant Events from our members
WebTucker On April 2, 2024 Bloomed
WebTucker On June 5, 2022 Fruit Ripened
Retro67 On April 6, 2024 Potted up
Retro67 On March 23, 2024 Seeds germinated
As of this date 20 seedlings have germinated.
Retro67 On March 4, 2024 Seeds sown
Prepared soil for sowing tomorrow after scarification. Base mix=90% compost=10% biochar. Mixed 2.5 gal. base with 12oz. perlite, 6oz. peat and 1oz. Azomite. Transferred mix into tree planting tubes (1 cup each) and added 1/2 tsp. "Dynomyco" mycorrhizal inoculant to each tube.
Retro67 On January 24, 2024 Seeds sown
Direct seeded around west and north perimeter of chicken run. Right into the snow.
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