Robinia pseudoacaciaIndiana Native
Black Locust

Family:

Fabaceae (Bean Family) 51

Genus:

Robinia (Locust Black Locust Locust, Black) 3

Plant Type:

Tree 583

Growth Forms:

Upright 578

Hardiness:

USDA Zone 3 236

Deciduous / Evergreen:

Deciduous 849

Flower Notes:

White (Extremely fragrant, creamy-white 1" dia. flowers on 4-8" racemes in May)

Foliage Notes:

Green (Dark bluish-green 6-14" long leaves with small leaflets, which cast a beautiful mottled shade in summer)

Stem Notes:

light reddish to greenish brown, slender, zig-zag, smooth

Fruit Notes:

Black (Flat pod; not ornamentally important)

Ultimate Height:

30-50 feet

Ultimate Spread:

20-35 feet

Bloom Times:

Fruiting Times:

July 109

Light Requirements:

Soil Water Requirements:

Dry to medium 50

Soil Notes:

Especially well adapted to poor, dry, alkaline soils; does not tolerate permanently wet soils

Range:

East-central to central United States, naturalized more widely

Maintenance:

Medium 87

Diagnostic Characteristics:

Leaves alternate and pinnately compound with 7 to 19 1-2" long leaflets. Paired stipular prickles at nodes. Stems are ridged. Old trunks have interlaced ridges resembling ropes.

Ecological Functions:

Purdue Plant Doctor

Parts and Problems of Black Locust

Special Characteristics:

Tolerant of Poor Site Conditions 189

Additional Information

Widely variable in form, the most picturesque are straight-trunked with branches abruptly fanning out at the top. Fixes N2. Locust borers are troublesome and difficult to control, but many trees live with them successfully for many years. Leaf minors and permanently wet soils can be problems.

Plant Photo Gallery

Tree Habit

Leaf

Flower

Thorns

Bark

Immature Fruit Pods

Buds

Thorns

Winter Habit

Flowers

When Robinia pseudoacacia has been observed flowering or fruiting at Purdue University

Flowering

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Fruiting

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28 Robinia pseudoacacia found

Building Map...

= Heritage plant = Memorial plant

Number	Accession ID	Location
1	2013_00985*C	HORTPARK
2	ORIG_3342*A	KFPC
3	ORIG_3344*A	KFPC	Heritage Plant
4	2009_13617*A	HORTPARK
5	2013_00408*A	HORTPARK
6	2013_00406*A	HORTPARK
7	2013_00605*A	HORTPARK
8	ORIG_3341*A	KFPC
9	2013_00985*D	HORTPARK
10	2009_13678*A	HORTPARK	Heritage Plant
11	2013_00469*A	HORTPARK
12	2013_00470*A	HORTPARK	Heritage Plant
13	ORIG_3354*A	KFPC
14	2009_13679*A	HORTPARK
15	ORIG_1321*A	PSYC
16	2009_13735*A	HORTPARK
17	2013_00409*A	HORTPARK	Heritage Plant
18	2013_00407*A	HORTPARK
19	2013_00356*A	HORTPARK	Heritage Plant
20	2013_00985*A	HORTPARK
21	ORIG_1323*A	PSYC
22	2013_00468*A	HORTPARK
23	ORIG_5176*A	ROGA
24	2013_00985*B	HORTPARK
25	2020_12728*A	HORTPARK
26	2020_12728*B	HORTPARK
27	2020_12728*D	HORTPARK
28	2020_12728*E	HORTPARK