Black Locust (Robinia pseudoacacia)

Common names:
Give a thumbs up Black Locust
Give a thumbs up Yellow False Acacia
Give a thumbs up Yellow Locust
Give a thumbs up Honey Locust

Botanical names:
Robinia pseudoacacia Accepted
Robinia pseudoacacia var. rectissima Synonym

General Plant Information (Edit)
Plant Habit: Tree
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: Mesic
Dry Mesic
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
Late fall or early winter
Flowers: Showy
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
Drought tolerant
Pollinators: Bees
Miscellaneous: Tolerates poor soil
With thorns/spines/prickles/teeth
Conservation status: Least Concern (LC)

Conservation status:
Conservation status: Least Concern

What's Blooming in FebruaryWhat's Blooming in February
February 18, 2012

Last month's Name That Bloom Contest subject was the Black Locust Tree, Robinia pseudoacacia 'Purple Robe.' Check in to see who was the first to give us the right answer and while you're here, check out this month's mystery flower, too.

(Full article42 comments)
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Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Jan 20, 2018 9:17 PM

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.

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Discussion Threads about this plant
Thread Title Last Reply Replies
Tree ID by thejfriz Nov 20, 2019 8:20 PM 13
Tropical looking shrub or tree ID pls! by Katonical Sep 5, 2019 7:48 PM 4
can you please help identifying this tree? by jsoso Sep 2, 2019 9:06 PM 5
Zombie tree that is taking over my yard (and my neighbors!) by TitaniumCoder477 Jul 27, 2019 4:17 PM 9
Something similar to Caragana arborescens. by Pavelas Jul 15, 2019 4:10 PM 2
What is this tree? by Baskiboat Jun 8, 2019 1:12 PM 8
Untitled by okgardens May 28, 2019 4:30 AM 3
tree ID please by mozart007 May 15, 2019 5:15 PM 3
Tree ID by EdwardY May 14, 2019 11:16 AM 10
Identify please by Brotherstree Mar 9, 2019 10:08 PM 7

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