Hardiness: 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) 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: Purple
Bloom Time: Late Winter/Early Spring Mid Spring 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 Drought-tolerant; suitable for xeriscaping
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
On Apr 16, 2013, palmbob from Tarzana, CA (Zone 9b) wrote:
Sad so many negatives, but I guess in other climates this plant is a nuisance... but here in the high deserts of California where few other things grow at all, this plant is amazing- adding some color where there simply is none, and growing without any supplemental water all year round (save the 2-4 inches we get in the winter)... handles high winds (it's windy EVEry day here, sometimes over 75mph), extremes in temp (summers here over 100 nearly every day, and snows in the winter), and looks great in early spring in full bloom. NO way is this invasive here.. in fact, I have never even seen it sucker here. One of the most attractive trees that one can grow in sunset garden zone 11.
On Mar 15, 2008, distantkin from Saint Cloud, MN (Zone 4b) wrote:
Black locust (Robinia pseudoacacia) is considered invasive by the Minnesota DNR
* 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."
We first saw this plant at Superstition Springs Mall in Mesa AZ. Trees line the lanes throughout the parking areas. I saw clusters of the seeds and grabbed a few to try. I've had the pink honey locust trees in CA. I'm going to plant the seeds and see what happens. We live East of Mesa, In Kearny. Wish me luck!
On Jul 11, 2007, cactuspatch from Alamogordo, NM (Zone 7b) wrote:
This tree is really pretty when in bloom. However the scent is strong and I am highly allergic to it. It was a bit fragile and was topped by a high wind, which caused it to die. Even though we dug it out 2 years ago, I am constantly cutting off the new shoots it is sending up, apparently from the roots that weren't dead? I would never plant this tree again. One short season of beautiful blooms is not work all the trouble it has caused. I now have a beautiful crepe myrtle in its place, long beautiful bloom, no disgusting scent to cause headaches for weeks, and no plants coming up all over the place.
On Mar 16, 2007, Bledsoe from Fort Collins, CO wrote:
Although suckering, and water spouts do frequently happen to this tree, it's absolutely a beautiful tree when flowers are in bloom. This tree can also be grown where most trees can't grow. Also when full grown has a great canvas
On Oct 24, 2005, Dianesgarden from Walnut Creek, CA wrote:
This cultivar is invasive, sending out additional underground shoots every year. These shoots grow into new trees and are resistant to pruning at ground level or digging up.
This plant has been said to grow in the following regions:
Dewey-humboldt, Arizona Kearny, Arizona Peeples Valley, Arizona Acton, California Arcata, California Banning, California Chowchilla, California Felton, California Redlands, California San Jacinto, California Simi Valley, California Waldon, California Denver, Colorado Fort Collins, Colorado Northfield, Illinois Thayer, Illinois Greater Upper Marlboro, Maryland West Pocomoke, Maryland Stephenson, Michigan La Luz, New Mexico Roswell, New Mexico Hereford, Texas Ivins, Utah Lexington, Virginia