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Yellow False Acacia, Black Locust, Yellow Locust
Robinia pseudoacacia 'Unifoliola'

Family: Papilionaceae (pa-pil-ee-uh-NAY-see-ee) (Info)
Genus: Robinia (roh-BIN-ee-uh) (Info)
Species: pseudoacacia (soo-doh-a-KAY-see-uh) (Info)
Cultivar: Unifoliola

Category:

Trees

Height:

30-40 ft. (9-12 m)

over 40 ft. (12 m)

Spacing:

20-30 ft. (6-9 m)

Hardiness:

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun

Danger:

Seed is poisonous if ingested

Parts of plant are poisonous if ingested

Bloom Color:

White/Near White

Bloom Time:

Late Spring/Early Summer

Foliage:

Grown for foliage

Deciduous

Smooth-Textured

Other details:

This plant is attractive to bees, butterflies and/or birds

Flowers are fragrant

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Non-patented

Propagation Methods:

From hardwood cuttings

From seed; direct sow outdoors in fall

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Seed does not store well; sow as soon as possible

Gardeners' Notes:

0
positives
0
neutrals
1
negative
RatingContent
Negative

On Mar 15, 2008, distantkin from Saint Cloud, MN (Zone 4b) wrote:

Black locust (Robinia pseudoacacia) is considered invasive by the Minnesota DNR
"Ecological Threat:

* Invades primarily disturbed habitats, degraded wood, thickets and old fields crowding out native vegetation of prairies, oak savannas and upland forests, forming single species stands.
* It reproduces vigorously by root suckering and stump sprouting forming a common connecting root system.
* It is native to the U.S. and occurs naturally on the lower Appalachian mountain slopes. It has been extensively planted for its nitrogen-fixing qualities and its hard wood."