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Purple Robe Locust

Item #8364, EZ Start®. Ships 1 - 2' tall with advanced root system in a 4x4x10" EZ Start® pot.
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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.

Shipping Restrictions

Agricultural regulations prohibit shipment of certain types of trees and plants. We do our best to provide a selection that gives everyone a chance to grow their own. This item cannot be shipped to all of MA.

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.


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Questions & Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 10 questions Browse 10 questions and 49 answers
Why did you choose this?
Stark Bro's Store
Ordered for our honey bees
KARRI B on May 1, 2016
Love the color purple as opposed to the regular white locust.
John K on Mar 18, 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
Has been my favorite tree for 20 years. Fast growing, hardy, and spring blossoms are beautiful.
Kenneth Q on Apr 11, 2016
Black locusts are loved by honeybees, and the red flowers would be awesome!
JEFFREY K on Mar 11, 2016
Does this tree have thorns?
psjh1 on Mar 26, 2016
BEST ANSWER: Yes but only when young. I have one tree that's three years old and there are very few thorns left, all in the upper foliage.
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: This tree was a rapid grower for us. We ordered the larger size. It grew three to four feet in the first year. We had it staked to ensure proper growth habit. We had some gusty winds (about 60 - 70 mph) in a storm and it snapped of. But the good news is that we trimmed off the damaged portion and it is growing just fine again. It is probably about 8 feet or taller now. It is just starting to get it's leaves and flowers (northern Ohio). It should be quite large in five years if yours grows like ours has.
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.
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 long do they take to blossom?
Brenda H on Mar 31, 2016
BEST ANSWER: Ideally, you should see your first flowers in approximately 2 years (depends on the location in which it was planted and other environmental factors).
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.
How well does this tree do in wind? Is it brittle or break easily?
Lindy R on Apr 12, 2016
BEST ANSWER: They are very flexible and will not be damaged by wind. Their flexibility will actually cause them to start to bend over under the weight of the leaf mast, so if you want them to grow straight and stay erect, plan on a staking them with 6' stake and some stretch tie tape. You will need to sink that stake about 18" deep, use a rebar to make a pilot hole and then manually push the stake into the hole.
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: Mine is a Purple Robe Locust planted in the fall 2014. I kept it watered well during the first year and in
2015 it produced a small number of pretty blooms. In 2016 it started to bloom in March with a large
number of blooms even up & down the stems. I love this tree! It is in direct sun the majority of the day,
and is near a cherry tree. I planted mine beside a fence which seems to help in windy weather due to
the heigth of the tree.
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).

Customer Reviews

5.0 / 5.0
13 Reviews
5 Stars
4 Stars
3 Stars
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1 Star
Purple Robe Locust
I have the only one in my neighbor hood.
May 5, 2016
over 2 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
1 year ago
Purple Robe Locust
Shrugs off dry conditions. Very winter hardy. The blooms are absolutely gorgeous.
May 11, 2016
1 year ago
Amazingly beautiful
This tree is so gorgeous that you can't take your eyes off it! Highly recommended!
May 4, 2016
over 2 years ago
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
1 year 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
1 year ago
The tree grew quickly and had tons of beautiful flowers the 2nd Spring.
May 20, 2016
1 year 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 2 years ago
Purple Robe Locust
After a few months in ground, this tree took root and had a few small branches. This year small purple flowers came out in the spring. Very happy with tree!
May 23, 2016
1 year ago
What you see is what I got!
I planted this tree last year and now I have these gorgeous blooms in east central Indiana. I really don't know why there aren't more planted, but I love it. Thank you Stark Bros.
May 15, 2016
1 year ago
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