Contact Us800.325.4180Live Chat $9.99 Flat-Rate Shipping plus Free Shipping on all orders $99+ Quick Order

Purple Robe Locust

Item #8364, EZ Start®. Ships 1' 6" - 3' tall with advanced root system in a 4x4x10" EZ Start® pot. Professionally pruned for FREE!
FREE Shipping
on orders of $99+*
tree icon What tree size should I choose? Read more & determine the perfect size for your yard.


Enjoy gorgeous flowers and comfortable shade! In spring, this stunner infuses your yard with dangling, wisteria-like clusters of fragrant, pink-purple flowers that can be clipped to make lovely bouquets. Also features young, metallic red leaves that mature to be a beautiful blue-green and provide cooling shade all summer. Cold-hardy and drought-tolerant. Matures to be 30-40' tall and 25-30' wide.


Bloom Color Pink, Purple
Shade/Sun Full Sun
Soil Composition Loamy
Soil Moisture Well Drained
Soil pH Level 6.8 - 7.5
Years to Bear 2 - 3
Zone Range 4 - 8

Zone Compatibility

This Variety's Zone Range 4 - 8
My Hardiness Zone ?
The USDA hardiness zones offer a guide to varieties that will grow well in certain climates. Each zone corresponds to the minimum winter temperatures experienced in a given area. Make sure that your hardiness zone lies within the zone compatability range of this variety before ordering.

Size & Spacing

Mature Size

When your tree matures, it will be approximately 30 - 40' tall x 25 - 30' wide.

Recommended Spacing

We recommend spacing these trees 25 - 30' apart to ensure room for growth.

Tools & Supplies

Having the proper tools and supplies when growing your own can make the difference between a good harvest and a great harvest! Here's a list that our experts recommend for this variety.

Planting & Care

Learn all about how to grow flowering trees in The Growing Guide. An entire section of our website dedicated to your growing success.

Shipping Information

Estimated Delivery Date

You don't pay until it ships.

We work hard to make sure that your order arrives at the ideal time for planting in your location. That's why we only ship living products during certain times of the year. Order now and your credit card won't be charged until your climate is suitable for planting success and your order is shipped.

Our Promise of Satisfaction

1 Year Warranty

Every order comes with our promise of satisfaction. If you aren't completely satisfied with your order, let us know within one year for a free one-time replacement or refund.


We've 'tagged' this item with specific keywords that help you find other products that share features or characteristics with this one. Select a tag below to view all the items that have that particular trait.

Questions & Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 29 questions Browse 29 questions and 132 answers
Why did you choose this?
Stark Bro's Store
Love locusts and really love this color
MARK S on Oct 6, 2019
Grew very quickly and had beautiful flowers. This is one of my favorite ornamental trees.
Veronica M on Oct 22, 2018
Love locusts and really love this color
MARK S on Oct 6, 2019
Beautiful - needed some flowers in the yard
KEN K on Apr 21, 2019
Grew very quickly and had beautiful flowers. This is one of my favorite ornamental trees.
Veronica M on Oct 22, 2018
It???s so cute
Dana C on Sep 20, 2018
Native to NY, grows quickly anywhere and has nice spring time appearance.
Bill M on Jun 9, 2018
We bought two a couple years ago and love them!
Sharon M on May 23, 2018
We have two honey locust trees and one other that I don't know the name of. There are no leaves to rake, they just blow away. Would like to try a locust with flowers.
Roberta H on Sep 2, 2017
I have 10 on each side of my driveway that I have planted with white flowering dogwoods. Thought this would be a great contrast by the house to the white flowers of the dogwood. The fragrant flowers will be fantastic when they bloom. Can't wait to have the fragrance drift into the house.
Bik Har W on Apr 19, 2017
I have one already and It is wonderful.
KATHERINE L on Apr 6, 2017
I Chose this locust for its lovely blooms and because it tolerates dry conditions.
Kathleen B on Apr 4, 2017
i have seen how beautiful these trees are and want one in my yard.
Mary Lou B on Mar 2, 2017
My favorite tree in my friends yard is a locust, I love the lacy foliage and the shape of these trees. His tree has white flowers, the pink is appropriate for my house being a lady, ha ha. I'm sure the bees will enjoy !
Trish H on Feb 7, 2017
had one in utah, love the look and scent
mark s on Jan 12, 2017
I used to have one of these lovely trees and I set a bird feeder next to it in the in the winter and they used the trunk of the tree to open the sunflower seeds:(. It was a magnificent tree. Smelled so wonderful. I very excited to find that I may purchase this amazing tree for such an remarkable price:). Much more affordable. Thank you:).
Linda H on Dec 16, 2016
To attract honey bees
Larissa Z on Oct 5, 2016
It's a fast grower and very pretty. I'm trying to hide a telephone pole that is visible from our kitchen window.
John O on Jun 5, 2016
Beautiful flowers
Igor C on May 27, 2016
Ordered for our honey bees
KARRI B on May 1, 2016
Has been my favorite tree for 20 years. Fast growing, hardy, and spring blossoms are beautiful.
Kenneth Q on Apr 11, 2016
Love the color purple as opposed to the regular white locust.
John K on Mar 18, 2016
Black locusts are loved by honeybees, and the red flowers would be awesome!
JEFFREY K on Mar 11, 2016
These were spectacular here in Kansas last year, and I wanted more.
DOUG K on Mar 8, 2016
Beautiful - needed some flowers in the yard
KEN K on Apr 21, 2019
It???s so cute
Dana C on Sep 20, 2018
Does this tree have thorns?
psjh1 on Mar 26, 2016
BEST ANSWER: A few short thorns widely spaced. Nothing like other locusts. Tree grows quickly 3-4 ft/year.
Will the roots get into the septic systems?
Tammy on May 12, 2016
BEST ANSWER: Tammy, I was a former Environmental Health Specialist so I know about septic system issues. I would not plant any tree too close to your septic field because trees will seek out the water from the leach field. Plant at least 30 feet or more away from the leach field especially when you are dealing with a large tree such as the Purple Robe Locust. Also, I don't know what kind of septic field you have, ie. standard, mound, pressure distribution etc. This will be a determining factor. It may be best to contact your local Environmental Health Office. Good luck with your tree!
How many inches does the purple robe locust grow each year? Or how big will it be in five years if I buy one from you???
Karen B on May 8, 2016
BEST ANSWER: Fast-growing, shallow roots (and runners). Medium sized tree. I had a mature one in the yard when I moved into my present home. It was 20 to 25 feet high and almost as wide. Depends on soil, climate and the health of the tree. I have one two-year old tree and it's probably 10 ft with a 2" or slightly bigger bole.
Our tree drops leaves heavily in late spring. Is this normal?
Inez S on Jun 17, 2016
BEST ANSWER: Definitely not normal. Leaves should be healthy and green until leaf drop in
autumn. Would check with your county agricultural extension agency to
identify the disease that is causing the problem.
do purple robe locust have thorns?
maryann c on Jun 19, 2018
BEST ANSWER: None of any real size. I've had mine for a year and I do notice teeny tiny little ones here and there but they stay very small and in my mind are a non-issue. I highly recommend this tree. Beautiful and fast growing.
does the purple robe locust grow runners on the ground? I have a quaking aspen that has roots that produce plenty of little trees which I don't want.
Pressie on May 15, 2016
BEST ANSWER: They do have runners which are most active if the tree is distressed in any way. I've also had quakies and controlled the runners with concrete barriers. You have to make sure you go deep enough or they'll just grow under. Mine are between 18 and 24 inches deep and I haven't had a problem since I poured them.
I have a sandy location. Does this tree withstand some drying out? Spruce and pine thrive here. Is this invasive? I am in a rural area. Slow or fast growing? Similar in habit to sunburnt locust?
Teresa W on Jan 4, 2018
BEST ANSWER: The Purple Robe Locust I bought a couple years ago is in a sandy location, between two large blue spruce trees and is doing amazingly well. It is now about 8 feet tall and flowered twice last summer, despite a late hard freeze that damage the newly opening buds. Having a BS in Forestry, I know black locust (including this one with pink flowers) are very hardy, soil and drought tolerant, fast growing and can spread via suckers. But so far I haven't noticed any suckers, just a cool little fast growing tree. I love Black locust and so do honey bees! One of their favorites! Hope this helps :-)
Is this tree a good source of nectar for honey bees?
roger on Aug 4, 2016
BEST ANSWER: Yes it is. Of course only while it is flowering. Hopefully by the time it loses its flowers there ill be other plants/trees that will be flowering.
How long do they take to blossom?
Brenda H on Mar 31, 2016
BEST ANSWER: I got a few token blooms the first spring but it was the following spring when they really blossomed out heavily.
Looking for a five foot tree that likes alot of water?
Frances E on Oct 9, 2019
BEST ANSWER: This tree is beautiful and grows fast. It will grow much higher than 5 foot. My tr
tree is 2 and is reaching 2nd floor of house. It is low maintenance. The blossoms
are like a wisteria appearance and not messy. I only watered it the first year and fertilized it 2 times a year, but we are in Midwest.
Would the tree be vulnerable to heavy spring snow?
Jim T on Aug 15, 2018
BEST ANSWER: Locust is a soft wood. It will be as vulnerable to a late, heavy spring snow as would a maple or fruit trees. The leaves are small and should be less vulnerable to a wet snow.
how long do the flowers last?
Eileen M on Jun 1, 2016
BEST ANSWER: We planted our whip last fall and after spring arrived this year it grew branches and flowered profusely! We were amazed!! Gorgeous!! The flowers lasted about 2 weeks which I think is typical for most flowering trees. You won't regret your purchase!!
The planting site I am considering gets about five or six hours of late afternoon (southern) and evening (western) sun. Has anyone tried to grow this tree in that amount of light?? There are nearby "volunteer" trees (due to my neglect) such as maple and cherry that grew from seed and are now 15-20 feet tall. They will be removed if there is a chance that the Black Robe Locust will grow and bloom.
Karen B on May 9, 2016
BEST ANSWER: I planted by Purple Robe Locust two years ago and now it is blooming with just 4-5 hours of direct sunlight per day! Amazing.
How well does this tree do in wind? Is it brittle or break easily?
Lindy R on Apr 12, 2016
BEST ANSWER: The tree's thinner branches may succumb to strong winds, so if you're in a notoriously windy area, you might opt for something with more durable limbs.
I had a couple of these planted and had a real issue with limbs breaking off. In fact the last time I tried the tree literally split in half. I would dearly love to have one but am afraid of them breaking down. Are your better?
tim f on Oct 31, 2017
BEST ANSWER: I have not had problems with limb breakage the two years that I have had it.

Perhaps if you head the longer limbs as they grow the limbs will be sturdier and not break.

Over fertilization will encourage long slimmer groth that is more prone to breakage.

Best Regards,

Does it have thorns? Is it highly PH tolerant?
Larry R on Sep 21, 2016
BEST ANSWER: Purple robe locust is under the category of pioneer trees. Not fussy about soil, they are nitrogen fixing and will provide shade and a lot of litter to help condition the surrounding ground. Flowers taste great too!
Can a Purple Robe Locust grow in a Tucson Az. climate?
Bruce on Apr 27, 2016
BEST ANSWER: I am in Texas, and It gets pretty hot. We had one that did so awesome, and never watered, but then we did some irrigation repairs, and found out it was drinking from a leaking valve. We fixed the valve, and the tree died. Now we have a few baby ones that are scattered around, and they are doing great with little to no watering, so if you get one they key will probably be consistency with watering or not watering.
Is this a nitrogen fixer like other locusts trees?
OrangeBlossom on Feb 16, 2018
BEST ANSWER: Yes. It???s actually a variety of black locust. I just love mine. The blooms are stunning and fragrant. It was planted as a whip in the spring and bloomed the next year.
What is the botanical name? Also, is it prone to borers as it ages?
SteveT on Aug 17, 2016
BEST ANSWER: This is from Missouri Botanic Garden:
"It is reportedly a hybrid cross between R. ambigua ???Decaisneana??? and R. hispida ???Monument???. However, some consider the plant to be a cross between R. pseudoacacia and R. hispida. In commerce, it is synonymous with and frequently sold as R. pseudoacacia ???Purple Robe???."

And this is what MO Botanic garden says on problems and good applications (I stuck mine way back in a woodsy setting, but where it is quite visible).


???Purple Robe??? is considered to be a very easy-to-grow tree. It thrives in many difficult growing conditions. It is also sometimes considered to be somewhat weedy. Trees send out underground root suckers that not only become a maintenance problem but also can disrupt nearby gardening areas. It is susceptible to locust borer (often fatal) and locust leaf miner (browns foliage). Other insect problems include caterpillars, weevils, scale and whiteflies. Possible disease problems include canker, powdery mildew, leaf spots, wood rots and verticillium wilt.

Garden Uses

Violet purple spring flowers make this an interesting tree for the landscape. It is considered to be a good selection for difficult areas in the landscape where other trees will not grow well. May be used as a street tree.
Is this tree safe to use around sheep and horses?
Does it have thorns like regular locust trees?
Helen T on Oct 3, 2019
BEST ANSWER: I don't know personally but looking online it sounds like it could very well be poisoness.
Mine does not appear to have thorns but. online it says some have been crossed and some havent,so some do but some don't. Sorry I wasn't much help.
do honeybees like this tree?
shelly on Jun 18, 2018
BEST ANSWER: Yes, we have had ours two years and it is growing and blooming nicely.
My daughter recommended it as she had one for more than five years with no suckers and lots of bloom. Hers was quite large. I think ours may be eight to ten feet now. We live in Ohio - northeast.
I know black locust will grow with black walnut trees, will a purple robe do ok with black Walnut trees around?
menchaca1167 M on Sep 25, 2016
BEST ANSWER: I've herd that a tree would not grow if planted inside the perimeters of the black walnut drip line. I assume that any tree can grow outside that perimeter.
Purple robe locust may be more susceptible to anything just because it is derived from the black locust, but you should do a research about this to confirm.

Does the purple robe have big seed pods?
Ricky t on Aug 2, 2016
BEST ANSWER: Mine has only been in for a couple of years, but it does not have large seed pods.
Would any portion of this tree, leaves, blossoms etc. be hazardous to my dogs?
Patty S on Apr 12, 2016
BEST ANSWER: The bark and leaves can be toxic if consumed in large quantities. The (raw) seed pods may be toxic in large quantities as well. I'd suggest you ask your vet what they think about your dogs being around this tree (Robinia pseudoacacia/black locust).
Is this tree ok to plant within 10-15 feet of sewer lines or sidewalks?
Carey P on Jul 18, 2018
BEST ANSWER: All locust trees are aggressive water seekers. So if your sewer line has open joints then one should not plant any tree close by especially a locust. If it is a closed pipe such as a sewer line from the house to the street then it will not invade the pipe. 10 feet from a sidewalk should be ok. I have several locust trees that have not lifted concrete close by. BTW the blooms on this tree are breathtakingly beautiful.
I have kentucky clay soil that is well drained on hillside. Looking for quicker growing tree for shade. Recommendations?
Greg M on Sep 27, 2017
BEST ANSWER: This is a big, beautiful tree for shade. You may want to take a look at these trees ... just click on the link, and then click on individual photos of the trees you might be interested in.
How long can I keep the tree in a container, if I'm not ready to plant it in the ground?
vsbest2017 on Apr 19, 2017
BEST ANSWER: Several months, at least. This tree grows quickly, so if you're not going to plant it for a number of months, make sure it doesn't become rootbound and pot up to a larger container.
We have four lovely robe locusts that were here when we bought the place. They are planted 8 -10 ft apart and are approx 12-15 ft high now. They are great shade trees but we are concerned that they are way too close together. Will they continue to thrive or should we transplant a couple of them?
Renee W on Jul 19, 2016
BEST ANSWER: They are recommended to be 25 to 30 feet apart.

Customer Reviews

4.7 / 5.0
64 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Nice Tree but be careful
They grow very quickly and are a beautiful tree but they are invasive. Their root system spreads out quickly and for large distances and reproduces mini trees all over the place. If you don't want that, then they are not the tree for you. I had mine for about 8 yrs and it grew quickly and produced an abundance of flowers in the spring. I just lost my tree yesterday in a quick thunderstorm with winds of 35-40 mph as the tree fell over. The trunk had stated to develop several splits (about tree of them in the trunk.) It was a very healthy tree otherwise, but the winds toppled the tree over anyways. I had a large branch split from this tree about 4 yrs ago and the tree continued on as if there was never any damage. I understand that split tree trunks are common for this tree, which makes it a tree that doesn't live too long. It appears that the trunk system and branches are vulnerable to cracking. I now have the job of cutting up removing a beautiful tree. I won't replace this with another purple robe as they aren't very stable for longevity.
July 13, 2017
Purple Robe Locust
We love our Purple Robe Locust tree. It arrived in great shape & bloomed the very first year! That was 3 seasons ago & continues to be one of our more prudent purchases. We would highly recommend this tree to anyone that loves hardy, fast growing trees, with beautiful, sweet fragrant blossoms. We would also like to expand our gardens with Black Flowering Locust trees, but have been unable to locate any. Please consider this choice as a future sapling offering.
May 14, 2016
over 5 years ago
The tree grew quickly and had tons of beautiful flowers the 2nd Spring.
May 20, 2016
over 4 years ago
I love it
I am located in Central Valley. I planted my tree in Feb. 2015 and Mar. 2016 it was already blooming and in May 2016 has grown to be about 8 feet tall. It has a nice bushy top. It is facing the West and gets the hot afternoon sun. I water once a week and it does just fine. I would definitely recommend this tree. I am planning to buy a couple more.
May 17, 2016
over 4 years ago
Purple Robe Locust
Planted the seedling last summer & were pleased with rate of growth. Although still very young, producing beautiful flowers.
May 12, 2016
over 4 years ago
Purple Robe Locust
Shrugs off dry conditions. Very winter hardy. The blooms are absolutely gorgeous.
May 11, 2016
over 4 years ago
I love this gorgeous tree!
Purchased this tree while was still living in AZ, was very suspicious about it. But the tree surprised me! It loves heat and sun. It grew fast and turned into tall lovely tree with bright green foliage by the mailbox. The deep purple blooms with strong sweet aroma make people stop and look at it.
September 1, 2016
over 5 years ago
Great tree
After a few years I can not complain about the tree, growth is about 13-14 feet in 3 years. That's fast! Flowers are beautifull but very heavy for the month of May.
May 18, 2016
over 5 years ago
Beautiful Purple Robe Locust
I love this tree! It is growing fast and has the most beautiful flowers this year! My honey bees love the tree. I highly recommend this tree.
May 4, 2017
over 3 years ago
Purple Robe Locust
I have the only one in my neighbor hood.
May 5, 2016
over 5 years ago