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How Fast Do Black Walnut Trees Grow? (Answered)

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All the deciduous walnut trees originate from the plant genus Juglans and Juglandaceae family. Walnut is a type of nut which is obtained from around 20 species of walnut trees.

So, there is a major curiosity encircling about the growth of the black walnut trees and how fast the black walnut trees grow.

This article will provide an in-depth answer to the aforementioned question and offer you deep insight into the growth rate of black walnut trees.

How fast do black walnut trees grow?

Black walnut trees grow 3′ to 4′ per year in favorable environmental conditions. Black walnut trees can reach 75′ to 100′ in height and spread about 50′ to 75′ in diameter in an optimum environment. In 20 years, a black walnut tree can grow up to 40 to 50 feet in height.

Black walnut trees grow 3 to 4 feet per year. After the plantation of the walnut seeds, it requires time to germinate the seed and grow the seedlings. Young walnut plants are planted in the open field.

It is essential to ensure good soil quality for enhanced growth of the walnut tree. It takes around 8 to 10 years to grow mature walnut trees from the young sapling.

Harvesting starts when walnut trees become mature. By then, the green outer hull of the walnut quickly starts to dry and split. Walnuts are quickly removed from the inner part during the walnut harvesting period, and nuts are properly dried.

The time to grow walnut trees can vary according to the kind of walnut species. Grafted black walnut trees require 4 to 5 years to mature before the initiation of harvesting.

On the other hand, black walnut trees to grow from the seedlings take 4 to 7 years before harvest.

How to make black walnut trees grow faster?

Several ways can be followed to grow black walnut trees faster. Here we have mentioned 3 tips concerning the faster growth of black walnut trees:


Black walnut trees require minimal watering because of their diverse root system. So, irrigation every two to three weeks is enough for black walnut trees to grow.

Avoid watering the trunk and lower branches of the plant to decrease the risk of the crown and root disease. Soaking 3 to 5 feet of the soil’s surface with water is essential for proper plant growth.

Fertilizer Use:

Applying fertilizer in the soil is a great approach to avoid plant diseases and deficiencies related to different compounds. Many plants face nitrogen deficiencies, and it can diminish plant growth.

Ammonium sulfate is sprinkled over the black walnut’s canopy during early spring to improve the nitrogen level.

Besides applying fertilizer, regular weeding of unwanted grass and plants are also necessary. Keeping a clean soil area around the black walnut trees is important for their growth.

Nutrient uptakes from soil become easier for black walnut trees in properly maintained soil.

The Andersons Professional PGF Complete 16-4-8 Fertilizer with Humic DG 5,000 sq.ft.

GMO Plants:

Seeds of genetically modified (GM) faster-growing black walnut are available in the market. They grow faster than the usual seeds of the black walnut tree.

Plantation of the genetically modified (GM) black walnut tree will provide rapid plant growth and improved walnut quality.

What conditions are best for growing black walnut trees?

Maintenance of proper environmental conditions is essential to achieve the best growth of black walnut trees. Maximum plant growth can be obtained only from optimal conditions. Moist, fertile soil is great for the rapid growth of the black walnut trees.

Soil texture varying from silt loam to silty clay loam and sandy loam to loam is optimal for growing black walnut trees. Black walnut trees can grow in both acidic and alkaline soil.

At least 63.5 cm of precipitation is necessary for the growth of black walnut trees. The cultivated field of the black walnut trees must be equipped with a good drainage system to remove excess water from the soil.

Though the black walnut plant can withstand harsh cold climates, optimum temperature (13°C) is best suitable to grow the black walnut trees. The growth rate of the plant declines in very cold climates.

Black walnut trees best thrive in the warmer region where water is abundant with the fertile lowland soil.

Where do black walnut trees grow best?

Black walnut trees grow in wide areas, including Canada to west Florida and west to the Great Plains. Black walnut trees can withstand various climate conditions, from the low-temperature regions to the warmer regions.

Black walnut trees can either grow individually scattered or in a group cluster. Both types of black walnut trees are found in the central and eastern regions of the United States.

Black walnut trees are pretty common in various regions of the United States. For this reason, black walnut is also called American walnut and eastern black walnut.

How many years does it take for a black walnut tree to produce walnuts?

It takes years before a black walnut tree produces walnuts. Before harvesting can begin, black walnut trees must mature.

Grafted black walnut trees take 4 to 5 years in maturation, and then it starts to produce walnut. And Black walnut trees require 4 to 7 years to mature after being planted from seedlings.

From the plantation of seedlings to the maturation and production of walnuts, it all depends on various factors.

For example, environmental factors, soil quality, plant cultivation methods, species quality, and many more play a vital role in the maturation and production of black walnut.

And all these factors determine the time required to produce walnuts in the black walnut trees.

How long do black walnut trees live?

Black walnut trees are native in the United States and are common in that region. A black walnut tree can be 200 years old. In perfect environmental conditions, black walnut trees can live around 150 years to 400 years.

In their long lifespan, black walnut trees can grow along with other plant species, e.g., Elms, Hackberry, Sugar maple, Basswood, etc.

Are black walnut trees hard to grow?

Black walnut trees grow best in warm climates and are easy to grow where enough sunlight is available. This plant requires at least six hours of direct sunlight for desirable growth.

Black walnut trees can grow in clay and rocky soil, but harsh soil conditions reduce plant growth. Black walnut trees can sustain growth in soil pH 6 to 6.5.

This plant can withstand a wide range of environmental conditions, and for this reason, it can grow easily in the Midwest, central and eastern regions of the United States.

How much is a 20-year-old black walnut tree worth?

Growing black walnut trees is economically viable for their demandable walnut and hardwood price.

The price of the black walnut tree depends on its diameter and size. Depending on the size and shape, a 20-year-old walnut tree may be worth 3000$ to 15000$. The price of a black walnut tree increases proportionally to the age of the tree.

Are black walnut trees harmful or poisonous?

Black walnut trees can be harmful to humans, horses, and dogs. Black walnut trees produce a poisonous chemical called juglone.

Ingestion of juglone may cause laminitis and respiratory illness to the horses. Dogs and other domesticated animals are also prone to juglone poisoning, which can lead to life-threatening situations.

Are black walnut trees bad for other trees?

Juglone is a poisonous chemical synthesized by the fruits, leaves, and roots of the black walnut trees. Juglone damages plant roots, and it can be detrimental to the neighboring plants.

Juglone toxicity results in yellow leaves, witting and, slow plant growth. Eventually, poisoning leads to root loss which can be threatening for the plant’s survival.

What can and can’t grow near black walnut trees?

Black walnut trees produce a chemical called juglone that is toxic for the neighboring plant’s growth.

Some plants are immune to the harmful effect of juglone and can grow near black walnut trees. Among them – Pot Marigold, Morning Glory, Pansy Viola, Squashes, Melon, Beans, Carrots, Corn, Cherry, Plum can tolerate the poisonous effect of juglone.

On the other hand, various plants are sensitive to juglone toxicity and can’t grow near black walnut trees. Among them – European Alder, White Birches, Hackberry, Crabapples, Red Chokeberry, Privet, Lilacs, Yew, Cabbage, Peppers, Tomatoes, Eggplant, Potato plants are susceptible to juglone toxicity.

Final Thoughts

Black walnut trees can grow 3′ to 4′ per year. Black walnut trees take 8 to 10 years to mature before walnut harvesting can start. A mature black walnut tree can reach 75 to 100 feet in length. Black walnut trees can easily grow in a wide range of soil conditions and can thrive in cold climates.

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