If you are an avid arborist or if you live in an area that was recently populated by native black walnut trees, you may have questions about how to plant a black walnut tree. Also, what other black walnut tree info can we dig up?
Black Walnut Tree Info
Black walnut trees are native to the central and eastern United States and until the turn of the century, quite common. These trees can live up to 200 years of age and are one of six walnut species found in the United States. In a natural setting, black walnut trees can be found growing alongside:
Intolerant of drought, black walnut trees have a lovely canopy, stretching up to 100 feet (30.5 m.) in height. Valued for their lumber, walnuts also provide food and shelter for native wildlife. Black walnut roots, however, contain juglone which may be toxic to some types of plants. Be aware of this and plan accordingly. The fruit husks from black walnut are used to make a yellow dye and the seed is used in candy making, abrasive cleaning products, and explosives.
How to Plant a Black Walnut Tree
Consider planting black walnut trees if you live in USDA hardiness zones 5a through 9a with at least 25 inches (63.5 cm.) of precipitation and 140 frost-free days per year. Black walnut trees do best growing in deep, fertile, moist, yet well-drained soil with textures ranging from sandy loam, loam, and silt loam to silty clay loam. Select a site that is facing north or east when planting black walnut and avoid areas in valleys, bottomland sites, or where airflow is minimal, as all of these foster potential frost damage. You'll need to choose an area of full sun as well. To grow your own black walnut, it's best to either purchase a tree, get a seedling from a local gardener who has a tree, or try to germinate your own by planting nuts. Gather the nuts and remove the husks. Plant six nuts, 4 inches (10 cm.) apart in a cluster, 4 to 5 inches (10-12.5 cm.) deep. As you no doubt have squirrels, pre-emptive caring for the black walnut trees is in order. Cover the planting area with a cloth and pin it to the ground. Lay a layer of mulch (straw or leaves) over the cloth to prevent repeated freezing and thawing. Mark the planting site clearly. The seeds will germinate in the spring. Remove the mulch and cloth in late winter. Once the trees have grown for a few months, choose the best ones and eliminate the others. Caring for black walnut trees is pretty straightforward after that. Keep them moist until they attain some size. Otherwise, the trees, although drought sensitive, have a deep taproot and should be fine as long as they are situated as stipulated above.
Gardening tips, videos, info and more delivered right to your inbox!
Sign up for the Gardening Know How newsletter today and receive a free download of our most popular eBook "How to Grow Delicious Tomatoes."
Amy Grant has been gardening for 30 years and writing for 15. A professional chef and caterer, Amy's area of expertise is culinary gardening.
15 Garden Trends To Avoid in 2024: Experts Warn Against These Outdated Designs
Garden trends come and go. We asked gardening experts to share the outdated trends that should be retired – and what you can do instead.
By Melanie Griffiths Last updated
How To Overwinter Ollas For Years Of Use: Get More From Irrigation Pots
If you overwinter ollas properly, you'll keep these unique watering pots from cracking. Here's how to protect them in erratic winter temperatures so they last longer.
By Mary Ellen Ellis Published
Choosing Juglone Tolerant Trees – Planting Trees Near Black Walnuts
If you want to plant trees next to black walnuts, you need ones with juglone tolerance. For more information, click here.
By Teo Spengler Published
Is My Black Walnut Dead: How To Tell If A Black Walnut Is Dead
Black walnuts are subject to diseases and pests that can kill them at any age. Click here and learn how to tell if a black walnut tree is dead or dying.
By Teo Spengler Last updated
Harvesting Black Walnut Trees: When Do Black Walnuts Fall
Black walnuts that are ripe will almost literally fall in your lap. All you need is a tarp, some containers, and knowledge of when do black walnuts fall. This article has information that will help with harvesting black walnuts.
By Bonnie L. Grant Last updated
Black Walnut Tree Compatible Plants: Plants That Grow Under Black Walnut Trees
The black walnut tree is a great hardwood tree that is grown in many home landscapes. However, because of its toxicity, some plants don't do well when planted around the black walnut. Read here for tolerant plants.
By Kathee Mierzejewski Last updated