Locust 'Decaisneana'

Robinia x ambigua

Family: Papilionaceae (pa-pil-ee-uh-NAY-see-ee) (Info)
Genus: Robinia (roh-BIN-ee-uh) (Info)
Species: x ambigua
Cultivar: Decaisneana



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

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

Flowers are fragrant

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


20-30 ft. (6-9 m)

30-40 ft. (9-12 m)


20-30 ft. (6-9 m)


USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

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)

Sun Exposure:

Full Sun


Seed is poisonous if ingested

Parts of plant are poisonous if ingested

Bloom Color:


Bloom Time:

Late Spring/Early Summer


Grown for foliage



Other details:

Unknown - Tell us

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:

Unknown - Tell us

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:


On May 31, 2016, brwnails from Riverside, IL wrote:

Acquired from Forestfarm in 2010 as a small whip. Took off right out of the gate, shot up to it's current 40+ ft size. Planted near patio for shade relief. Very airy, more elegant habit than native black/honey locusts. Flowers mid-May here in Chicagoland. Fragrant, light pink blossoms. It does have small thorns occasionally, similar to rose in shape. Folliage is clean, non-buggy, and holds up well to drought.


On Nov 19, 2013, meg1705 from Dunedin,
New Zealand wrote:

How interesting that the previous comment is from so close by! I only managed to definitively identify the beautiful tree in my friend's garden when it flowered. We will try and propagate more. It is probably close to fully grown now but is excellent near the house - doesn't block the view of the hills behind it, is light and airy with an elegant structure, casts lovely dappled shade, hasn't suckered at all and although the branches are brittle this hasn't caused any problems so far. Another striking feature not often mentioned is its stripey grey-green and white bark.


On Jan 30, 2009, baiissatva from Dunedin,
New Zealand wrote:

9b coastal Otago New Zealand

This is the Pink Wisteria Tree, it's foliage very similar to the familiar robinia pseudoacacia 'Frisia' except that it is medium green instead of golden. I think the tree is a little more gracile in form than the latter, being a bit more 'lacy' in it's layered branches and general visual delicacy.
This is a central tree in the 'arboretum' section of our half acre coastal garden and while it had a little shelter from the high prevailing winds, it's planted in rubbishy clay soil and gets zero attention, as well as having to contend with a good deal of competition from other trees. It also began life as a skanky little abused twig from the 'bargain' section of the nursery. In five years it had recovered from it's poor start and blossomed in... read more