Purple Robe Locust Tree

As low as $69.99 was $99.99
Availability: In stock

Need a fast-growing, hard-wooded, easy-care, extremely ornamental native tree? We literally can't keep this tree in stock! The flowering Purple Robe Locust Tree (Robinia pseudoacacia 'Purple Robe') is an improvement of the native Black Locust tree!

It's become incredibly popular because of its great purple flower color and excellent fragrance! But once established, tough Purple Robe Locust trees are also super hardy and drought tolerant with a brisk growth rate of 2 or 3 feet of growth each year!

Purple Robe Locust trees develop incredible, long clusters of purple-colored flowers in mid-to-late spring that look very much like Wisteria flowers. These beautifully fragrant clusters cover the tree profusely and may be up to eight inches long each! It is an impressive display, and you will definitely want to cut a few and bring them indoors to enjoy in a cut flower arrangement. Bees and beneficial insects love the flowers as much as you will!

Each spring, the leaves emerge reddish bronze, before maturing to dark blue-green. The large compound leaves have smaller blue-green leaflets, and you'll love the fine-textured look of the tree in summer. Fall clean-up is easy with these small leaves, too!

This improved variety is much less thorny than its predecessor but keep an eye out because it's common for this tree to grow a few thorns. Hardy throughout USDA growing zones 4 to 8, these trees feature compound leaves that cast light-dappled shade over your landscape, then turn yellow in the fall!

Planting and Application:

Our horticultural team has put together recommendations on how to best use this tree in your landscape! This tree is an excellent barrier plant to protect your property beautifully! Mix into a shelterbelt or windbreak hedge to add height and airy texture to your landscape hedges.

You can plant this tree as an easy-care, fast-growing specimen in your lawn. Mow the grass right up to the trunk to keep the plant as a single stem. Front and backyards gain lush shade without sacrificing your green lawn!

Locusts are durable and rugged enough to be used in commercial plantings, parking lots, and as street trees along the road without worry the roots will get into trouble! Handling the tough conditions by the road with ease! Plus Locust trees are very hard-wooded and will tolerate storms, wind, and snow-load well! They will grow just about anywhere and make an excellent small yard tree, needing little fertilizer or much of anything else!

  • Fragrant, Wisteria-Like Purple Flower Clusters
  • Fast Growing & Easy to Grow
  • Mid-Sized Ornamental Flowering Tree
  • Fine-Textured Oval Leaflets
  • Excellent, Hard-Wooded Street Tree, Shade & Specimen Lawn Tree

#ProPlantTips for Care:

As with any plant, proper site selection is key to success and to YOUR happiness. Plant Purple Robe Locust in an open, sunny space where it will get plenty of light and air circulation. The beauty of this mid-sized ornamental tree is that it can grow in just about any condition as long as the soil drains quickly after a rain. Even in poor, infertile soils, the Tree seems to do well! After they are established, Black Locust cultivars only need supplemental watering during extended periods of drought.

Top the soil with a 3-4 inch thick layer of arborist mulch - especially when planted in the lawn. Create a buffer zone extending 3-4 feet from the trunk to protect the bark from mower and weed-wacker damage. Timing is important! Wait until late spring when the flowers are done blooming before making any pruning cuts. You won't want to miss any of the show!

  • Full Sun Deciduous Tree
  • Highly Adaptable to Any Well-Drained Soil
  • Moderate to Low Moisture Needs Once Established
  • Prune When Dormant
  • Handsome Tree is Tough as Nails
  • Heat Tolerant & Waterwise Once Established

It's time for you to jump on this. We ALWAYS sell out of this incredible flowering ornamental tree and this year will be no exception. Don't wait for your chance to own this gorgeous tree, order your own Purple Robe Black Locust Tree now!

Buying Options for Plants

Nature Hills sells a large variety of plants with several options available. Plants are offered in both potted containers and as dormant bare root without soil. Here is a helpful resource to understand your options as you create a beautiful landscape with help from Nature Hills.

Ever wonder what a larger plant will mean for your landscape? Container Sizes are really all about the age of the plant!

Seasonally, Nature Hills offers hand selected, high quality bare root trees, shrubs and perennials. Bare root plants are sold by height from the top of the root system to the top of the plant. Plants may be taller than the height minimums.

  • Popular sizes of select trees are 1 foot, 2 feet, 3 feet, etc.
  • Popular sizes of select bare root plants is 1 foot, 18 inches, etc.

Nature Hills Container Size by Volume

Keep in mind, specific varieties and different growing conditions can affect the rate at which plants grow. Variations in size may occur.

Young Plants to 18 Months
Size Volume
2"x2"x3" Ranges from .18 to .21 dry quarts / .198 to .23 dry liters in volume
4.5" Container Equal to .65 dry quart / .72 dry liter in volume
Sprinter Pot Equal to .63 dry quart / .69 dry liter in volume
4" Container Ranges from .31 to .87 / .35 to .96 dry liter in volume
6" Container Equal to 1.4 dry quarts / 1.59 dry liters in volume
1 Quart Equal to 1 dry quart / 1.1 dry liter in volume
5.5" Container Equal to 1.89 of a dry quart / 2.08 dry liters in volume
4"x4"x5" Ranges from .8 to 1.1 dry quarts / .88 to 1.2 dry liters in volume
4"x4"x6" Ranges from 1.0 to 1.3 dry quarts / 1.1 to 1.41 dry liters in volume
4"x4"x9" Ranges from 1.1 to 2.1 dry quarts / 1.2 to 2.3 dry liters in volume
4"x4"x10" Ranges from 1.7 to 2.3 dry quart / 1.87 to 2.53 dry liters in volume
Plants 18 Months - 2.5 Years Old
Size Volume
2 Quart Equal to 2 dry quarts / 2.2 dry liters in volume
#1 Container Ranges from 2.26 to 3.73 dry quarts / 2.49 to 4.11 dry liters in volume
5"x5"x12" Equal to 3.5 to 4.3 dry quarts / 3.85 to 4.74 dry liters in volume
Plants 2 - 4 Years Old
Size Volume
#2 Container Ranges from 1.19 to 1.76 dry gallons / 5.24 to 7.75 dry liters in volume
#3 Container Ranges from 2.32 to 2.76 dry gallons / 10.22 to 12.16 dry liters in volume
Plants 3 - 5 Years Old
Size Volume
#5 Container Ranges from 2.92 to 4.62 dry gallons / 12.86 to 20.35 dry liters in volume
#6 Container Ranges from 5.25 to 6.01 dry gallons / 23.12 to 26.42 dry liters in volume
#7 Container Ranges from 5.98 to 6.08 dry gallons / 26.34 to 26.78 dry liters in volume

About Plant Sentry™

Plant Sentry is designed to protect both consumers and the nursery trade from invasive plant pests and diseases. Sites that display the Plant Sentry protection badge are protected from consumers buying and nurseries shipping material carrying invasive pests and diseases.

This proprietary eCommerce software prevents the shipment of a restricted plant to each state. The Plant Sentry system includes a shipment certification program. The Plant Sentry Compliance Officer works closely with NatureHills.com and each nursery or fulfillment center to ensure only compliant plants are sold to customers.

Click Here to learn more

Plant Sentry


To obtain a more accurate shipment time-frame, simply enter your zip code in the “Find Your Growing Zone” box to the right. Our plants are grown all over the country and lead time on items may be different because of this. Once your order is placed, you will also receive the specific shipment time-frame information as part of your order confirmation. Once an item ships, you will receive shipment notification and tracking numbers, so you can follow along while your plant travels to your doorstep. We use FedEx, UPS, or USPS at our discretion.

Due to winter weather we have put a hold on shipping to the areas shown below in grey. You can still order now and we will ship the plant to you during an appropriate time for your zone.

*If you have found your zone already, it will be highlighted in the table below.
Color Zone Times
3 Spring 2019
4 Now
5 Now
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Shipping Rates

At Nature Hills we handle, package and ship the products you order with the utmost care to ensure healthy delivery. Shipping and handling charges are calculated based on the tables below. Please note that some items include an additional handling surcharge, these will be noted on the item's product page.

From To S&H
0 - 19.99 24.99
20 - 49.99 29.99
50 - 69.99 34.99
70 - 99.99 39.99
100 - 129.99 44.99
130 - 149.99 48.99
150 - 150+ Approx 28%

Click here to see our full rates


Purple Robe Locust Tree Is Suited to Grow in Zones 4-8
Growing Zones 4-8
More Information
Brand Nature Hills' Choice
Botanical Name Robinia pseudoacacia 'Purple Robe'
Type Deciduous
Mature Height 30 - 40 feet
Mature Spread 20 - 30 feet
Sun Exposure Full Sun
Soil Widely Adaptable
Moisture Well-Drained
Growth Rate Fast
Flower Color Drooping Purple Clusters
Foliage Green
Fall Color Yellow
Pollinator Friendly Yes
Pruning Time After Flowering
Fragrant Yes